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What Is a Cover Letter?

Understanding cover letters, types of cover letters, how to write a cover letter, tips for writing a cover letter.

• Cover Letter FAQs

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What Is a Cover Letter? Types and How To Write One

A cover letter is a written document commonly submitted with a job application outlining the applicant's credentials and interest in the open position. Since a cover letter is often one of only two documents sent to a potential employer, a well- or poorly-written letter can impact whether the applicant is called for an interview .

Key Takeaways

• A cover letter is commonly submitted with a job application explaining the applicant's credentials and interest in the position.
• A good cover letter complements the resume and explains why the candidate is the ideal person for the job.
• Common cover letter mistakes can sink a job applicant.

Investopedia / Joules Garcia

Most job postings are done online and no longer require a physical application. Instead, applicants send companies a copy of their resume along with a cover letter either by email or with a hard copy through the mail. A resume offers a glimpse into the professional and academic experience of a potential employee. The cover letter, on the other hand, acts as an introduction written by the candidate to express their interest in the position and what makes them the best fit for the job.

A good cover letter complements a resume by expanding on items relevant to the job. In essence, it's a sales pitch that describes why the applicant is the best person for the position. Career experts advise job seekers to spend time customizing each cover letter for the particular position, rather than using a generic missive. Although this requires extra effort, it can be very helpful in allowing an applicant to stand out above the competition.

The cover letter provides information to the employer about who the candidate is as a professional and as a person. This includes their areas of interest, professional goals, knowledge, skills they've gained over the years, achievements, passions, and aspirations. The cover letter should be a one-page document that provides a clear and concise idea about why the candidate is the best person for the job . It should also highlight the cultural fit.

While there is no set template for a cover letter, the type of letter that you write will depend on the requirements of each individual company or employer. The information that is included in a cover letter will vary depending on the goals and purpose of your application.

• An application cover letter is the most familiar type of cover letter. This is generally written in response to a vacancy that is posted on a company's website or a job board. In addition to answering any specific questions posted in the job ad, it may also highlight any experience or skills that are suitable for the position.
• A referral cover letter is similar to an application letter, but it includes the name of a colleague or employee who recommended the applicant for the open position. A strong referral can help you stand out against other applicants.
• A prospecting cover letter , also known as a letter of interest, is written by a job seeker and addressed to a company where they would like to work. However, it is not aimed at a specific role or vacancy. Instead, this type of letter inquires about open positions in general and may highlight any special skills that make the writer suitable for the company.

When employers post a job ad that requires a cover letter, they may specify certain requirements for the cover letter to address. For example, they may require applicants to answer certain questions, or to respect a certain word limit. It is important to follow these requirements, as they reflect on the applicant's ability to understand and follow directions.

If the employer does not set any expectations, a typical cover letter should be about a page or less, and may include a formal greeting, contact information, and links to the applicant's portfolio or work. It should highlight any special skills, and explain why you would be a good fit for the position. This is your chance to impress the employer: Even if your resume does not have everything an employer wants, a well-written cover letter can make the applicant stand out from the crowd.

However, it is possible to include too much information. Most employers will simply glance at the majority of their cover letters, and a long-winded essay might end up at the bottom of the pile. A few short paragraphs explaining your skills, and why you chose that specific employer, should be enough to put your best foot forward.

Writing a cover letter doesn't have to be tedious—even though it may seem like it's a chore. Here are a few simple tips you may want to consider when composing your cover letter:

• Personalize your letter for each role. Never use a generic cover letter. This means you have to write a new one for each position. Be sure to include your strengths and skills, and explain why you’re the perfect candidate.
• Include contact information. If the posting doesn't include the hiring manager's name, call the company , or check its website. Including this person's name gives your letter a proper greeting and also shows you have initiative. And don't forget to add your contact information, too. This is important if your resume gets separated from your cover letter.
• Simplify your letter. Communicate clearly and concisely. Using complex words and sentences would most certainly fail to convey your intentions with the company and the person reading the letter probably won't bother with the rest of your application.
• Be specific when needed. Don't rehash your resume, so be sure to quantify your accomplishments. For instance, expand on your marketing experience in your cover letter by saying you brought in 200 additional clients each month and increased revenue to $10,000. This can set you apart from candidates with vague personal details.
• Proofread. After you’ve written the letter, go over it a few times to ensure there are no errors. Then ask someone else to do a once-over and recommend any changes you may need to make.

A simple, focused cover letter without any typos or grammatical errors will get you noticed by potential employers.

A perfect resume can often be sabotaged by a poorly thought-out cover letter or one that is laden with mistakes. Whether you include the letter as per required submission guidelines, or you simply want to emphasize your interest in the job, make sure you avoid making these blunders.

• Names matter. This includes the name of the hiring manager, the company, and yes, even yours. Make sure you have the right names and the correct spelling. And don't forget to change the names if you're using the same cover letter for multiple jobs.
• Restating your resume. Since the cover letter is used to identify your skills and explain how your previous experience is applicable to the desired position, don't restate the stuff on your resume. Remember, the cover letter should complement your resume, not just summarize it.
• Keep your letter tight. Recruiters often go through hundreds of applications and don't have time to read through a three-page missive. The absolute maximum length for a cover letter should be one page, with a few concise paragraphs.
• Omit unnecessary details. Stay on topic. There's no need to mention your graphic-design skills if you're applying for an accounting position. It's a good idea to leave out personal things like your IQ, recreational accomplishments, interests, and hobbies. That is unless they relate to the job or company.
• Avoid sounding arrogant. Ensure your cover letter does not make you appear arrogant . While the cover letter is about you and your accomplishments, find a way of saying "I'm the best" without actually saying it. Avoid overusing words like "I," "me," or "my."
• Remember that spelling counts. Typos and grammatical errors can show you didn't bother to proofread your own letter. And make sure to be consistent—don't convey a dash with "--" in one place and "—" in another.
• Design matters : with the proliferation of publishing, design trends, and software, candidates have become creative in making their cover letter stand out from a design perspective. Make sure your cover letter projects your personality in terms of design while remaining professional. That is personal signature and branding.

How Long Should a Cover Letter Be?

According to Indeed , a leading job-seeking site, a typical cover letter should be about three or four paragraphs long and highlight any special experience or achievements that make the applicant exceptionally well-suited to the position.

How Do You Start a Cover Letter?

A cover letter should start with a formal greeting, preferably addressed to the hiring manager. If you do not know who will be reading your cover letter, a generic "to whom it may concern" is an acceptable, albeit old-fashioned, way to address a cover letter. It is also acceptable to address the letter to a title, such as "Dear Hiring Manager," or "Dear Talent Acquisition Team."

What Should a Cover Letter Contain?

An effective cover letter should highlight the applicant's skills, experience, and any achievements that make them a good fit for their prospective employer. It is also a good chance to mention anything that is not included in the resume: For example, if an applicant is drawn to a certain employer because they love a certain product, the cover letter is a great place to mention it. Make sure your cover letter also includes your name and contact information.

In a competitive jobs market, an effective cover letter is one way to make a job application stand out. This is a chance for an applicant to demonstrate why they think they would be a good fit. However, a poorly-written or meandering cover letter can hurt an application more than it helps.

Harvard Extension School. " Resources and Cover Letters: An Extension School Resource ," Pages 3 and 5.

Harvard Extension School. " Resources and Cover Letters: An Extension School Resource ," Page 5.

Jobscan. " Cover Letter Formats ."

Indeed. " What Is a Cover Letter? "

Indeed. " How to Address a Cover Letter (With Examples). "

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How and Why to Write a Great Cover Letter

A cover letter is a one-page business letter that you submit when applying to a job, along with your resume. As a piece of persuasive writing, your cover letter will aim to convey to the employer why you’re a great candidate for the role.

What is the purpose of a cover letter?

Your cover letter complements your resume by making it easy for the employer to see how your experience and interest connect to the position. Your goal is to convince the employer to interview you.

With your cover letter, you’ll aim to:

• Highlight your qualifications:  You’ll show how your skills and experience relate to the employer’s needs for a specific position.
• Showcase your motivation: You’ll demonstrate your enthusiasm for the specific position and the organization.
• Reflect your voice and written communication skills: You’ll give the employer a sense of your personality and writing style.

When should I write a cover letter?

Not all jobs require cover letters. So, how do you decide whether to submit one?

Submit a Cover Letter when…

• The posting explicitly requests that you do so
• You’re applying to an opportunity at a mission-driven organization
• You think that doing so could provide important information to the employer that they wouldn’t get from your resume

Consider Submitting a Cover Letter when…

• It’s marked “optional” in an application, and you have the bandwidth to do so
• You have content that you can easily recycle or repurpose into a tailored cover letter

No Need to Submit a Cover Letter when…

• A posting specifically tells you not to submit one
• There’s no way to submit one in an application portal, and doing so would require a serious workaround

If you’re applying to several similar opportunities, creating a draft cover letter in advance, geared toward that type of opportunity, can be a helpful way to save time in your actual application process.

How do I write a cover letter?

Your cover letter should articulate your qualifications and motivation for the position. Read the job description closely and research the organization. As you craft your cover letter, use examples that demonstrate your relevant skills, knowledge, and interests. The cover letter should be concise, clear, and well-organized.

Before Writing

Research the employer.

Learn enough about the organization to articulate why you are a strong fit for that firm. 

• Review the firm’s website and LinkedIn page.
• Speak with current or previous employees.
• Read articles and social media for current news.

Analyze the job description

Look for skills, duties, and qualifications of the job so you can design your letter to match these as much as possible.

Reflect on your experience and motivation

Identify skills and personal qualities you have developed which will be useful in this role. Ask yourself:

• What attracts you about this role/company/industry?
• What have you have done in your work experiences, classes, internships, activities, projects, volunteer work, travel, etc., that is similar to the duties required of the job? 

Cover Letter Structure

As a business letter, the cover letter should include:

• Heading: Include your name and contact information in the same format as your resume
• Salutation: Address your letter to the specific individual who can hire you, if this is known. If the name is not included in the job description, address the letter to the Hiring Manager or title mentioned in the job description.
• Body Paragraphs:  Discuss your experiences, interests, and skills to show the employer how you can add value to their team. See the section below for more guidance.
• Signature Line: Include a closing and your name.

The cover letter should be one page, about three or four paragraphs, and single spaced. Use 10-12 point font and one inch margins. 

When applying online, upload your cover letter as a PDF file, unless another format is specified. When sending your resume and cover letter by email, you may write a short note or paste your cover letter in the body of your email (without the address header) and also attach the PDF file.

Cover Letter Content

Your cover letter should answer who, what, when, where and why you are applying for the opportunity. 

Introduction

State the position for which you are applying. If you have a referral or spoke with someone from the company, you can mention it in the introduction. Provide some basic information about yourself; this can include your class year and what you’re studying at Columbia. Briefly outline why you’re interested in the organization and what you bring in terms of relevant experience and skills. 

Body Paragraphs

These paragraphs will highlight your qualifications and strengths that are most relevant to the organization and position. Use the job posting and your research as clues to determine what the employer is seeking in a candidate. Have your resume beside you and reflect on what you want the employer to know about you. Are there experiences you want to expand upon that demonstrate your understanding of the role and ability to do the job requirements?

Structure the paragraphs based on relevance, not chronology. Lead with your most relevant skill or strongest experience.

Start each body paragraph with a clear topic sentence.  This can highlight a key skill set, a transferable experience, or a core area of knowledge you’ve built through your studies. Walk the reader through a project or experience, integrating the relevant skills you used and qualities you demonstrated. Provide details about your accomplishments and impact. Connect how these experiences have prepared you for this role and why you are motivated to do this job. There is no need to apologize if you feel you lack experience; focus on the accomplishments that you have.

Recap what you would bring to the organization and your interest in the position. Thank the employer for their consideration. Keep your tone positive and enthusiastic. 

Check out our example of how to structure your cover letter content . 

Editing Tips

Use our  Cover Letter Checklist to make sure your format and content is in line with best practices. 

• Ensure that the content reflects the requirements in the job description
• Keep the cover letter concise, at one page or less
• Correct any errors in grammar, sentence structure, and spelling
• Use the active voice
• Avoid beginning too many sentences with “I”

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What Should You Include in Your Cover Letter? [w/ Tips for 2024]

You’ve spent weeks job hunting, and you’ve found the perfect job.

Your resume is all set, and you’re almost ready to send your application.

There’s just one thing left—you’re writing a cover letter to create a flawless job application.

The only issue? You're not sure what exactly to include in your cover letter.

There’s no need to worry! We’re here to help

In this article, we’re going to cover:

• What Is a Cover Letter
• What Elements Should Your Cover Letter Include
• What You Shouldn’t Include in Your Cover Letter

Let’s get started.

What is a Cover Letter?

A cover letter is a document that you send as part of your job application, along with your resume or CV .

The cover letter’s purpose is to introduce you and briefly summarize why your professional background makes you the right person for the job.

On average, a cover letter should be between 250 and 400 words long and fit neatly on one page.

A cover letter is one of your first forms of communication with a hiring manager. It’s your opportunity to present yourself in your own words, stand out from other candidates, and get the hiring manager interested in learning more about you.

Let’s take a look at an example of what a cover letter looks like:

Why Do Cover Letters Matter?

After you’ve spent so long making the perfect resume , you might be wondering why you should even write a cover letter.

The truth is that while not all employers request a cover letter, you should always include one with your job application.

Adding a cover letter to your job application shows the hiring manager you’re willing to go the extra mile for the job, and you’re not just randomly applying and hoping your application sticks.

A cover letter is your opportunity to give the hiring manager more information about you as a candidate. This is your chance to personalize your application and provide additional information on your skills and experiences that align with what the employer is looking for and that you didn’t have space on your resume for.

But your cover letter is also your chance to go beyond your most important skills and experience. You can use it to talk about your passion for the industry or your enthusiasm to join this specific company’s team and show the hiring manager that you’re serious about the role.

If your cover letter is good, it can complement your resume and get you that much closer to an interview.

A badly written cover letter, on the other hand, could undermine even the best resume and lead to your application getting tossed in the ‘no’ pile, so it’s crucial to get this document right.

Need help preparing for an interview? Check out our guide to the most common interview questions and how to answer them!

What Elements Should You Include in a Cover Letter?

There are a few key elements you need to include to write a successful cover letter .

Let’s take a look at them one by one:

#1. A Professional Template

Your cover letter should be easy on the eyes and even easier to navigate.

This means you have to set the right page margins, adjust the line spacing, choose an appropriate font , and set it to the correct size, all while making sure your text never spills onto page two.

But what if there’s an easier way? 

Just use one of our cover letter templates instead.

Our free resume builder comes with built-in resume templates that you can match with a cover letter template for a stylish application.

You can automatically set your font style, size, and even the dimensions of the paper you intend to print it on - standard A4 or US letter format.

#2. Neatly-Split Paragraphs

A cover letter should be easy to navigate at a glance.

If your cover letter is a huge chunk of text that fully covers the entire page, without paragraphs or ample white space, it’s going to look cramped and leave a bad impression on the hiring manager.

This is where your cover letter’s formatting comes in. You should divide the contents of your cover letter into a header with contact information, and then split the actual text into an opening paragraph, a main body, a conclusion, and a formal closing line.

Be sure to also use line breaks and bullet points to break up your paragraphs to increase your cover letter’s readability.

This can make it seem less of an overwhelming read to the hiring manager and easier for them to skim through it all to find what they’re looking for.

#3. The Date of Writing

The exact date you write your cover letter may seem like a small detail, but it can actually add an extra touch of professionalism to your job application.

This can help the hiring manager keep track of when you’ve applied for the role, and it reflects your attention to detail .

Just keep in mind that the format of the date should align with the standard in the country where you're applying. For example, in the US , the mm-dd-yyyy format (e.g., May 22, 2024 ) is the go-to, whereas most other countries prefer the dd-mm-yyyy format (e.g., 22 January 2024 ).

#4. Your Interest in the Company

It’s important to tailor your cover letter for the specific job you’re applying for to show the hiring manager that you’re a serious candidate who’s done their homework about the position.

This is why the body of your letter should always include a paragraph where you clearly explain why you’re interested in the specific company.

Start by doing some research on the employer . You have to show the hiring manager that you understand what makes the company unique and how you align with their values and needs.

Think about what you genuinely like about the company you’re applying for. Whether it’s their remote working conditions, their focus on diversity or sustainability, or something else entirely, be sure to mention it in your cover letter.

If you’ve used a product or service that the company provides, say so in your cover letter. On top of that, highlight what specific aspects of the company resonate with your career goals , such as their innovative methods or cutting-edge market strategy, that you want to be a part of.

You can also take the time to explain why you’re excited about the job itself. Talk about how your unique experience and skills make you a suitable candidate and how you’re confident you can contribute to the company’s goals.

Looking to write a cover letter for an internship ? Check out our detailed guide!

#5. A Call to Action

Every cover letter should end with a strategic call to action.

Your call to action can be a polite statement prompting the hiring manager to get in touch with you to go over your application or to discuss how you could contribute to their team.

Adding a call to action at the end of your cover letter shows that you’re proactive and eager to move forward with the hiring process. This highlights your enthusiasm for the role and makes it more likely for the hiring manager to get in touch with you after putting down your cover letter.

Here’s an example of a call to action at the end of a cover letter :

I am very enthusiastic about the opportunity to discuss how my artwork can contribute to Happy Hippo Book Publisher’s track record as the best children’s storybook provider on the market. Please feel free to contact me at the provided phone number so that we can discuss my application further.

Want to give your cover letter an extra kick? Use these tried and tested cover letter tips !

What Sections Should You Include in a Cover Letter?

When writing your cover letter, you can easily split the process into several key sections.

Let’s break them down:

• Header with contact details. The top of your cover letter should include a designated header where you can input your contact information, such as your full name, email address, phone number, address, and links to any relevant social media. Make sure these details match your resume and double-check for any typos.
• Company details. Do your research so you know exactly who to address your cover letter to. Add the hiring manager’s name, department, the company’s name, and the company’s address.
• Personalized greeting. Skip the cliche and impersonal “To Whom It May Concern” and use a more memorable greeting instead. We recommend using “Ms.” or “Mr.” followed by the hiring manager’s last name.
• Opening paragraph. Your cover letter should start with a brief and attention-grabbing paragraph . This should include a couple of your top skills, an impressive achievement, or a relevant qualification.
• Main body. Take the time to explain some of your top achievements or skills in more detail, and cover anything you didn’t have the space to address in your resume.
• Conclusion. Recap the main points in your cover letter so far, then wrap it up with a polite call to action.
• Closing line. Choose an appropriate closing line to finish your cover letter with and sign your name underneath.

What Should You Never Include in a Cover Letter?

A cover letter allows you to personalize your application and provide more details about you to the hiring manager.

But that doesn’t mean everything should make the cut.

Let’s look at what you should never include in your cover letter:

#1. Irrelevant information

Your cover letter should be concise and focus on the most relevant details that make you the right candidate for the job.

Hiring managers don’t have all day to spend on your application, and when they’re reading your cover letter, they want to get to the point quickly. If your cover letter includes too many personal anecdotes or irrelevant experiences, like how you worked as a dog walker at 15, they might get bored and stop reading it altogether.

A cover letter is, first and foremost, a professional document, not a personal essay. This means that focusing too much on yourself, as well as your wants, needs, and opinions, is not a good idea.

Your cover letter should focus on what you can do for the employer, not what they can do for you. If you miss the mark here, you’ll come off as an inattentive candidate and won’t be getting an interview.

#2. Overly Long Paragraphs

A dense, difficult-to-read text can discourage a hiring manager from going through your cover letter.

For example, if the body of your cover letter is contained in a single, thick paragraph, the hiring manager might skim over it and miss your main points.

Long paragraphs can also make your cover letter look poorly organized and make you come across as someone with bad written communication skills . Your essential qualifications and skills can get lost in that sea of words and hide the most important information you want to convey.

Overly long paragraphs also imply a lack of consideration for the hiring manager’s time. Keeping your text concise and easy to follow is just as important as the content itself. Otherwise, your cover letter might not catch the hiring manager’s attention at all.

#3. Salary Expectations

Unless the employer specifically asks you to, it’s considered taboo to include salary expectations in your cover letter, and it can even leave a bad impression on the hiring manager.

Talking about money in your cover letter can make it seem like your primary interest in the job is the paycheck. And, while there’s nothing wrong with wanting a specific salary, this can seriously undermine what you want to convey to the hiring manager about your enthusiasm for joining the company and your professionalism.

You should also keep in mind that talking about salary expectations so early on can even put you at a disadvantage in potential salary negotiations . If you mention a high number too early on, the hiring manager might reject your application before you even make it past the initial screening. But if you go too low, you could undervalue yourself.

This is why it’s recommended that you discuss salary expectations during an interview once you already understand the full scope of the role and have more context.

Are you just getting started on the job market? Check out our guide to writing an entry-level cover letter !

#4. Excessive Flattery

Writing a cover letter doesn’t mean writing a love letter to the company you’re applying for.

You don’t need to shower the employer with compliments to get the hiring manager to like you. In fact, if you use too many compliments or describe the company in the exact words they use on its website, you’re going to be severely disappointed.

For example, most companies you apply to may describe themselves as “innovative” or “ team-focused .” If that’s all you can say about them in your cover letter, it tells the hiring manager that you never researched the employer or paid much attention to what they do.

If you genuinely hold the company’s values, mission, or culture close to your heart, there’s no harm in mentioning how they inspire you. Just remember to keep it professional and related to how you can enthusiastically contribute to their work.

#5. False Information

This should go without saying but lying on your cover letter is just as bad as lying on your resume – very bad.

We get it; you want to impress the hiring manager. But exaggerating or falsifying information to make yourself look like the coolest candidate ever can easily backfire.

On one hand, the hiring manager is probably going to catch onto you while reading your cover letter. They’re going to notice the inconsistencies you didn’t pay attention to, and they simply won’t call you.

But it could be even worse. You could land an interview, only to have the hiring manager discover the truth face to face. Your professional reputation could suffer some serious damage, beyond just an awkward interaction during the interview.

Trust us – lying isn’t worth it. You’re capable of writing a standout cover letter without exaggerating anything you can’t back up.

#6. Grammatical Mistakes

You should always proofread your cover letter before submitting it with your job application.

Even when you’re absolutely sure there are no mistakes, sometimes you might miss something that the hiring manager will notice immediately.

This is why we always recommend you do several rounds of proofreading and editing before finalizing your job application.

Start by carefully reading your cover letter out loud. It might sound a little weird, but it helps you notice any awkward phrases or words that are out of place.

Then, run it through a spell-checking tool like QuillBot or Grammarly . They can help you spot any errors you might have missed.

Finally, ask a friend or family member for help. A fresh pair of eyes can read your cover letter and notice mistakes that both you and your robot sidekick might have skipped over.

#7. Complaints About Employers

As a general rule, you should never badmouth your previous place of employment.

If you were unjustly fired or passed over for a promotion for personal reasons, these are best explained during an interview.

It’s important to always maintain professionalism when your past employer or coworkers are brought up, especially in your cover letter.

For example, instead of saying you had enough of a chaotic work environment, you could say you’re “looking forward to joining a team that values structure and accountability.”

Check out these more common cover letter mistakes and keep an eye out while writing your cover letter!

29 Cover Letter Examples

Looking for inspiration? Check out these perfect cover letter examples for different professions.

#1. Customer Service Cover Letter

Check out our full guide to writing a customer service cover letter here.

#2. Marketing Executive Cover Letter

Check out our full guide to writing a marketing executive cover letter here.

#3. Medical Assistant Cover Letter

Check out our full guide to writing a medical assistant cover letter here.

#4. Consultant Cover Letter

Check out our full guide to writing a consultant cover letter here.

#5. College Student Cover Letter

Check out our full guide to writing a college student cover letter here.

#6. Retail Cover Letter

Check out our full guide to writing a retail cover letter here.

#7. Team Leader Cover Letter

Check out our full guide to writing a team leader cover letter here.

#8. Actor Cover Letter

Check out our full guide to writing an actor cover letter here.

#9. Digital Marketing Cover Letter

Check out our full guide to writing a digital marketing cover letter here.

#10. Executive Assistant Cover Letter

Check out our full guide to writing an executive assistant cover letter here.

#11. Finance Cover Letter

Check out our full guide to writing a finance cover letter here.

#12. Graphic Designer Cover Letter

Check out our full guide to writing a graphic designer cover letter here.

#13. IT Cover Letter

Check out our full guide to writing an IT cover letter here.

#14. Project Manager Cover Letter

Check out our full guide to writing a project manager cover letter here.

#15. Sales Cover Letter

Check out our full guide to writing a sales cover letter here.

#16. Accounting Cover Letter

Check out our full guide to writing an accounting cover letter here.

#17. Business Cover Letter

Check out our full guide to writing a business cover letter here.

#18. Dental Assistant Cover Letter

Check out our full guide to writing a dental assistant cover letter here.

#19. Human Resources Cover Letter

Check out our full guide to writing a human resources cover letter here.

#20. Nurse Practitioner Cover Letter

Check out our full guide to writing a nurse practitioner cover letter here.

#21. Receptionist Cover Letter

Check out our full guide to writing a receptionist cover letter here.

#22. Architect Cover Letter

Check out our full guide to writing an architect cover letter here.

#23. Management Cover Letter

Check out our full guide to writing a management cover letter here.

#24. Physician Cover Letter

Check out our full guide to writing a physician cover letter here.

#25. Substitute Teacher Cover Letter

Check out our full guide to writing a substitute teacher cover letter here.

#26. Software Engineer Cover Letter

Check out our full guide to writing a software engineer cover letter here.

#27. Administrative Assistant Cover Letter

Check out our full guide to writing an administrative assistant cover letter here.

#28. Mechanical Engineering Cover Letter

Check out our full guide to writing a mechanical engineering cover letter here.

#29. Attorney Cover Letter

Check out our full guide to writing an attorney cover letter here.

FAQs About What to Include in a Cover Letter

Do you still have some questions about what to include in a cover letter? Check out the answers to some of the most frequently asked questions on the topic!

#1. What is a good example of a cover letter?

There are plenty of great cover letter examples for different professions that you can look at.

Overall, a cover letter that’s well done starts with your contact information in a designated header at the top. Next, you have to add the hiring manager’s contact details and include a personalized greeting.

Write a strong opening paragraph that references the job you're applying for and includes a standout achievement or relevant experience that makes you a strong candidate.

Use the body of your cover letter to expand on your key skills and experiences that match what the employer is looking for. Give specific examples to illustrate your greatest accomplishments and how you gained your most impressive skills.

Wrap up your cover letter by recapping your key selling points and including a call to action that invites the hiring manager to reach out to you. Lastly, add a professional closing line and sign your name underneath.

#2. How do you start a cover letter?

The opening to your cover letter should be brief and attention-grabbing.

Your first few sentences should be something that makes the hiring manager want to learn more about you. You don’t want to give them too many details—just enough to pique their interest.

Explain why you’re writing and why you’re interested in the specific role. We recommend including keywords from the job ad , especially ones that match your most relevant skills, experiences, or impressive achievements.

#3. How do you write a unique cover letter?

Your cover letter is your chance to give the hiring manager a unique insight into you as a candidate. It’s your opportunity to stand out from the crowd using your own words.

The best way to write a unique cover letter is to start by researching the company and referencing anything you find attention-grabbing about it. You should be able to easily identify what you like about the specific employer, such as their contributions to the industry, their values, and reputation, and mention it in your cover letter.

Use a polite but conversational tone to convey both your professionalism and personality. Instead of using passive language to explain that you “managed” this or were “responsible for” that, take advantage of action verbs and power words to make your experiences stand out.

Avoid using generic phrases like how you’re a “team player” or have “ leadership skills ” alone, and instead provide concrete examples that back up the skills and experience that make you the right candidate for the job.

#4. Should a cover letter be fancy?

Since a cover letter is a formal document, you might be tempted to make it fancy.

There’s no need to go over the top with your cover letter. Adding too much decoration or creative flair can detract from the information you want to convey to the hiring manager.

Your focus should always be on writing a clear, concise, and well-organized text that gets your point across.

More traditional industries, like law or finance, should stick to minimalistic cover letter templates with a clean and simple layout.

For professionals aiming for creative industries like illustration or graphic design, a bit of color can make your application pop. Even then, it’s important to strike a balance between creativity and professionalism, so your cover letter’s text remains the hiring manager’s primary focus.

Key Takeaways

And that’s all there is to what you should include in your cover letter!

Hopefully, after reaching the end of our article, you feel confident that your cover letter covers all the necessary bases. Good luck on your job hunt!

But before we say goodbye, let’s briefly recap what we've covered so far:

• Your cover letter should be concise and avoid any irrelevant information. The hiring manager is interested in what you can do for the company, not in any personal information that doesn’t relate to the job.
• Overly long paragraphs and a messy layout can leave a bad impression. Instead of trying to format everything yourself, use an online cover letter builder.
• Our online resume builder offers resume templates and matching cover letter templates that you can use to create a stylish and professional job application in minutes.
• Dedicate a portion of your cover letter’s main body to express your genuine interest in the company and the specific role. Do some research beforehand so you can identify several things you genuinely like about the company and position you’re applying for.
• End your cover letter with a strategic call to action. This shows the hiring manager you’re eager to make it to the next step of the hiring process, and it makes it more likely for them to reach out to you.

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What is a Cover Letter? Definition, Structure, Purpose, Types & Meaning

In This Guide:

What is a cover letter, what is the purpose of a cover letter in a job application, what to include in a cover letter, cover letter format and layout, should you use a cover letter template or example, what is a cover letter - takeaways.

Asking yourself, “What is a cover letter?”

In this article, we break down for you the basics about cover letters, their purpose, and what to include in yours.

When you’re applying for a job, a cover letter is just as important as your resume in a lot of ways.  You always want to include a cover letter when you’re submitting your resume, to personalize the facts about your work history and to tailor your application to the job.

But if you haven’t written a cover letter before, it can be intimidating to figure out what to include. Don’t worry, this expert guide boils it all down into a quick read that gives you an overview and points you in the right direction to find everything you need to know about them.

In this post, we’re going to cover:

• What is a Cover Letter?
• What is the Purpose of a Cover Letter in a Job Application?
• What to Include in A Cover Letter

We also describe how you can lay out your cover letter to amp its impact, and we’ve even made it dead simple for you by including some perfect cover letter examples for you to check out.

A cover letter is a one-page document that you include with your resume as part of your application for a job. A good cover letter grabs a Hiring Manager’s attention and gets you to the next step of the hiring process.

While every job you apply for will have either a specific application form or will ask for a resume, not every one will ask for a cover letter.  But you should always include one – it’s a game changer.

The upshot is that a resume is a summary of your work and education experience, while your cover letter adds relevant context to that experience for the specific job.

A cover letter is tailored to a specific job you’re applying for, and it highlights what your qualifications are and how they relate to that role and company. You can use it to give examples of how your experiences relate to the role and show how you’re the best person for the job.

Just as its name implies, a cover letter is written in a letter format, including a greeting, three or four body paragraphs, and a closing. Unlike a resume, your cover letter should be written in full sentences, and you want to use the first-person – “I’m writing to you today to…”.

You don’t want to just rhyme off the same things that are in your resume, though.  Use your cover letter to give real life examples of how your experience, skills, or interests make you perfect for the job.

Head to our full article on the differences between a resume and a cover letter to learn more on this.

Put simply, it’s your chance to make a great first impression. It’s a tool you use to grab a hiring manager’s attention long enough that they look over your resume a bit closer and call you in for an interview.

A cover letter may not be something a job posting asks you to include, but don’t think that means you shouldn’t.  A good cover letter is always a good idea, here’s why:

• You can tell a story in a cover letter that dives deeper into your qualifications,
• experience, and interests to show why you’re the best candidate for the job.
• A lot of candidates skip writing a cover letter, so by including one you immediately put yourself ahead of the competition!
• You can introduce yourself in a more personalized way and tailor your application specifically for the job.
• You can add a bit of flair or personality that gets a hiring manager to ask you in for an interview
• It shows that you put effort into your application, which again, puts you ahead of most of the competition.

This is just a snapshot of how a cover letter can help you. We’ve got a great article for you to look over if you want to know more about the purpose of a cover letter .

Should you send a cover letter for a job?

There is no question, yes, you should absolutely include a cover letter with your application.

We’ve done our homework on this and can tell you: a majority of hiring managers need or expect a cover letter, even if it’s not specified in the job posting.

Not only are they expected, but they’re a great tool for you too:

• Explain the reasons for any work gaps
• Clarify how the experience you have from other jobs applies
• Show how you fit their company culture
• Let them know why you’re changing jobs or fields

So, while a cover letter may not absolutely be necessary, they’re extremely useful, and always something you should take the time to write and include with your application.

Cover letters should usually include some of the same basic elements. We’ve put together a quick list below, but head over to our complete guide on what to include in your cover letter for a full explanation.

• A header – This is where you’re going to include all the contact info the hiring manager is going to expect to see.  You want to be sure to give them what theyère looking for.
• Opening statement – You can get right to it here and make sure this is an attention grabber.  Summarize your skills or experience and give them one good reason why it’s important for the job you’re applying to.
• Body – This paragraph should give some more details about you personally.  Employers often hire someone for who they are, not what they know; this is your time to show them you’d be a great fit on their team.
• Closing and Call to Action – You want to close your cover letter with a thanks for the time they’ve taken and a professional sign-off.  You should also let them know you’re eager to hear from them, and let them know to contact you to follow up.

Try to end with a great impression. It’s key that you know how to close your cover letter well to hit all the right notes.

A hiring manager takes about 7.4 seconds to look at each resume that comes across their desk, and there may be hundreds of those. A strong cover letter design can grab their attention long enough for them to set you into the callback pile instead of in the recycling bin.

We’ve put together the details on how you can really grab a recruiter’s attention with your cover letter design , but here’s the basics:

• Font - Always use a standard, easy-to-read font like Times New Roman or Arial. It should be 12pt or slightly bigger.
• Heading – Always use a professional format of heading, which includes your name and contact info, the date of writing, and the contact info for the person you’re writing to.
• Spacing – You want to single space the body of your cover letter, but leave spaces between the heading, the greeting, each paragraph, and your sign-off.
• Length – We know that it’s tempting to try to fit in as much as possible in the cover letter, but this is definitely a case of less is more.  You want the content to be about half a page, so shoot for between 250-400 words.

Keeping your cover letter lean can be hard the first few times you write one. Check out our article on ideal cover letter length to get more tips on how to hit the sweet spot.

If you’re already a pro, maybe you can go it on your own and write a killer cover letter.  But if this is your first cover letter, or you have any doubts, use our Cover Letter Examples to get some great ideas on how to write and format yours – we’ve got a few samples below.

Our examples cover different industries and positions, so you can fine tune the fit of your letter for exactly the job you’re applying to without trying to reinvent the wheel!  Plus, these are cover letters that work to get interviews, so you can be sure you’ve got a great start.

If you want a real head start, we’ve even got a Cover Letter Templates page where you can head to get all the basics covered for you. Head there, input your specifics, and you’ll have a winning cover letter, easy-peasy.

• A cover letter is a one-pager you include with a job application to dive deeper into exactly why you are the best fit for the job.
• You always want to include a cover letter, even if it’s not specified in the job posting.
• Hiring managers get hundreds of resumes, and they fly through them - your cover letter can and should be designed to grab their attention.
• Personalize your cover letter and tailor it to the specific job you’re sending it in to, this includes relating specific skills, letting your personality shine, and getting the hiring manager’s name.
• Make sure it’s in perfect shape to get great results.  Use our Cover Letter Checklist to make sure you’ve covered all the bases and haven’t overlooked any little mistakes that could cost you the job.

• Cover Letter Guides

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• Career Blog

What Is an Enclosure in a Cover Letter? Definition & Tips

Cover letters are important documents that accompany a job application. They serve as an introduction to the candidate and provide an opportunity to highlight their relevant skills and experiences. A well-written cover letter can help a candidate stand out in a crowded field of applicants.

One aspect of a cover letter that is often overlooked is the enclosure. An enclosure is a document that is included with the cover letter, such as a resume, writing sample, or other supporting materials. The purpose of the enclosure is to provide additional information that supports the candidate’s qualifications.

In this article, we will delve into the definition and purpose of an enclosure in a cover letter. We will explore the various types of documents that can be included as enclosures, and provide tips on how to effectively use them to strengthen your application. By the end of this article, you will have a clear understanding of what an enclosure is and how to use it to your advantage in your job search.

Where to Include Enclosures

When it comes to including enclosures in your cover letter, it’s important to know where to include them based on the type of cover letter you will be using. Here are the different places to include enclosures depending on the type of cover letter you are using:

A. Electronic Cover Letters

Email:  If you are submitting your cover letter via email, you can include the enclosure either in the body of the email or as an attachment. If you choose to include it as an attachment, make sure to mention it in the body of your email as well.

Online Submission Forms:  Some companies may require you to submit your cover letter through an online submission form. In this case, there may be a designated section where you can upload your enclosure.

B. Physical Cover Letters

Mailing:  If you are mailing your cover letter, you can include the enclosure by stapling it to the cover letter or placing it in the same envelope. Make sure to mention in your cover letter that you have enclosed additional materials.

Hand Delivery:  If you are hand delivering your cover letter, you can either staple the enclosure to the cover letter or include it in a separate folder or envelope.

Remember, including enclosures can be a great way to provide additional information about yourself to potential employers, but make sure to only include relevant and necessary materials.

Types of Enclosures

When submitting a cover letter, you may be required to include various types of enclosures. These can include a resume, CV, references, writing samples, certifications, relevant projects, and other supporting documents. In this section, we will go through each of these types in detail to help you understand what they are and how to include them in your cover letter.

A resume is a document that summarizes your work experience, education, and relevant skills. It is typically a one-page document that showcases your professional accomplishments and provides a quick overview of your qualifications. When including your resume as an enclosure in your cover letter, make sure it is up-to-date and relevant to the job you are applying for.

A CV, or curriculum vitae, is a more comprehensive document than a resume. It includes not only your work experience and education but also publications, presentations, and other academic achievements. A CV is commonly used in academic or research settings and can be longer than two pages. If the job you are applying for requires a CV, be sure to include it as an enclosure in your cover letter.

C. References

When applying for a job, it’s important to have references who can attest to your professional capabilities. Including a list of references as an enclosure in your cover letter can demonstrate your preparedness and readiness to work with the company. Be sure to ask permission from your references before including them in your cover letter.

D. Writing Samples

If the job you are applying for involves writing or requires a specific writing style, including writing samples as enclosures in your cover letter can help demonstrate your skills. Choose samples that are relevant to the job and showcase your unique writing style.

E. Certifications

If you have certifications relevant to the job you are applying for, including them as enclosures in your cover letter can provide additional credibility to your application. These can be industry-specific certifications or general ones like CPR or First Aid.

F. Relevant Projects

If you have completed relevant projects in your field or have personal projects that demonstrate your skills, including them as enclosures in your cover letter can set you apart from other applicants. Be sure to explain the relevance of each project to the job you are applying for.

G. Other Supporting Documents

If there are other supporting documents that you believe can help showcase your qualifications for the job, including them as enclosures in your cover letter can be beneficial. These can include publications, awards, or other relevant materials.

When submitting a cover letter, including enclosures can help demonstrate your qualifications and professionalism. Be sure to choose the appropriate type of enclosure for the job you are applying for and ensure they are relevant and up-to-date.

Proper Formatting and Labeling for Enclosures

Enclosures are an important component of a cover letter and serve as a means to provide additional information to the recipient. To ensure that the enclosures are easily identified and understood, it is important to use proper formatting and labeling.

A. Labeling Guidelines

When labeling enclosures, it is important to use clear and concise language that accurately describes the enclosed documents. Use a descriptive title, such as “Resume” or “References,” to clearly indicate the type of document enclosed. Avoid using vague titles, such as “Documents,” which do not provide any meaningful information.

It is also important to number the enclosures to ensure that they are accounted for and that none are missing. Use a consistent numbering system, such as “Enclosure 1,” “Enclosure 2,” etc., and include the corresponding number in the cover letter or email. This will make it easier for the recipient to cross-reference the enclosed documents with the cover letter or email.

B. Location of the Label

The label for the enclosure should be placed either at the top or bottom of the document. If you choose to place the label at the top, center it and make it bold and slightly larger than the text in the body of the document. If you place the label at the bottom, align it with the left margin.

C. Aligning Multiple Enclosure Labels

If you are enclosing multiple documents, it is important to align the labels to make them easier to read and reference. Align the labels either horizontally or vertically, depending on the number of enclosures and the available space. Remember to number the enclosures in the order in which they appear in the cover letter or email.

For horizontal alignment, place the labels side-by-side and evenly spaced. For example:

Enclosure 1 Enclosure 2 Enclosure 3

For vertical alignment, stack the labels one on top of the other, aligned with the left margin. For example:

D. Placement of Enclosures in the Cover Letter

In the cover letter, mention the enclosed documents and briefly describe their contents. This will provide the recipient with an idea of what to expect and help them quickly locate the relevant information.

Place the enclosure label(s) after the closing and signature of the cover letter or email. This will ensure that the recipient sees the label(s) before they begin reviewing the enclosed documents.

Proper formatting and labeling of enclosures are essential in a cover letter. Use descriptive titles and consistent numbering, place the label at the top or bottom of the document, align multiple labels, and mention the enclosed documents in the cover letter. Following these guidelines will help ensure that the recipient can quickly and easily identify and review the enclosed documents.

Tips for Including Enclosures in a Cover Letter

When it comes to enclosing additional documents or materials with your cover letter, it’s important to follow some simple guidelines to ensure that you’re including the right information in the right way. Here are some key “do’s” and “don’ts” to keep in mind:

A. Do’s for Enclosing on Cover Letter

Keep It Relevant:  Any materials you include with your cover letter should be directly related to the job you’re applying for. Whether it’s a writing sample, a project proposal, or a portfolio of your work, make sure that everything you include is relevant to the position and will help the hiring manager get a better sense of your skills and experience.

Label It Correctly:  Make sure that any additional documents or materials you enclose are clearly labeled with a title or description that makes it clear what they are. This will help the hiring manager easily locate and review the materials as needed. Additionally, if you’re sending multiple documents, consider numbering them to help keep them organized.

Make It Easy to Access:  Whether you’re submitting your materials electronically or physically, make sure that they’re easily accessible and available to the hiring manager. If you’re emailing your application, consider including links to your materials rather than attaching large files. If you’re sending a physical application, make sure the materials are neatly organized and easy to locate.

B. Don’ts for Enclosing on Cover Letter

Including Too Much Information:  While it’s important to include any relevant materials that will help the hiring manager get a better sense of your skills and experience, you don’t want to overload them with unnecessary information. Stick to the most important and relevant materials, and avoid including anything that doesn’t directly support your application.

Forgetting to Label:  It’s easy to get caught up in the process of assembling your application materials, but don’t forget to clearly label each document or material that you include. Without clear labeling, the hiring manager may not know what they’re looking at or how it relates to your application.

Including Unrelated Documents:  Finally, make sure that any additional materials you include are directly related to the job you’re applying for. While your resume or cover letter might be tailored to multiple positions, any additional materials you include should be specific to the job at hand. Resist the temptation to include unrelated documents or materials that won’t help build your case for why you’re the best candidate for the position.

By following these simple guidelines for including enclosures with your cover letter, you’ll be able to present a clear and compelling case for your candidacy while making it easy for the hiring manager to review your application.

Common Mistakes to Avoid when Enclosing on Cover Letter

When creating a cover letter, it is important to avoid making common mistakes that can have a negative impact on your application. Here are some common mistakes to avoid when enclosing documents with your cover letter.

A. Wrong Document Type

One common mistake applicants make is enclosing the wrong type of document with their cover letter. For example, enclosing a resume when the employer only requested a cover letter can make you seem careless or unprofessional. Be sure to carefully read the job posting or application instructions to determine what documents are required.

B. Typos and Grammatical Errors

Another mistake to avoid when enclosing on your cover letter is having typos and grammatical errors. These mistakes can make you appear less credible and distract from the content of your application. Take time to proofread and edit your cover letter before submitting it.

C. Improper Formatting

Improper formatting is another mistake that applicants make on their cover letters. Using difficult to read fonts, too much bolding, or not enough white space can make your cover letter difficult to read. It is best to keep your cover letter simple, clean, and easy to read.

D. Not Including Contact Information

A final common mistake to avoid when enclosing documents with your cover letter is not including your contact information. This information should include your name, email address, phone number, and mailing address. You can include this information at the top of your cover letter or in the signature block. This allows the employer to easily contact you if they have any questions or want to schedule an interview.

By avoiding these common mistakes when enclosing your documents on your cover letter, you can increase your chances of making a positive impression with potential employers. Take the time to carefully review and edit your application materials to ensure that you are presenting yourself in the best possible light.

The Importance of Enclosure in a Cover Letter

A well-crafted cover letter is an essential part of any job application process. It serves as a marketing tool to showcase your qualifications, skills, and experience that make you the perfect candidate for the position. However, one aspect that is often overlooked by job seekers is the inclusion of enclosures in their cover letter. An enclosure refers to any additional documents that support your application, such as your resume or portfolio.

But why is the enclosure section so important, and what does it say about you as a candidate?

A. Shows Your Professionalism

First and foremost, the inclusion of an enclosure section in your cover letter displays professionalism. It shows the hiring manager that you are detail-oriented, organized, and have taken the time to provide them with all the necessary documents upfront. Remember, hiring managers receive hundreds of applications, and anything you can do to set yourself apart and make their lives easier will be greatly appreciated.

B. Provides Additional Information

Moreover, the enclosure section can provide employers with additional information that may not be readily apparent in your resume or cover letter. For example, if you are applying for a graphic design position, you could include samples of your work in the enclosure section to showcase your design skills. Similarly, if you are a recent graduate, you could include transcripts to demonstrate your academic abilities.

C. Demonstrates Attention to Detail

Lastly, the enclosure section is a great way to demonstrate attention to detail. It shows that you have carefully read and followed the application instructions, including any requests for additional documents. Employers want to hire candidates who pay attention to the details and take pride in their work.

Including an enclosure in your cover letter is crucial. It not only shows your professionalism, but it can also provide employers with additional information and demonstrate your attention to detail. So, make sure to take the time to gather all the necessary documents and present them in a clear, organized manner. Your effort will not go unnoticed by potential employers, and it may just be the thing that sets you apart from other candidates.

Example of Cover Letter Enclosure

A. cover letter example.

Dear Hiring Manager,

I am writing to apply for the [Position] role at [Company]. Enclosed, please find my resume, along with other supporting documents that I have included for your review.

As a skilled [Industry] professional with [Number] years of experience, I am confident in my ability to contribute positively to [Company] and hit the ground running in this position. My experience in [Skill 1], [Skill 2], and [Skill 3] have prepared me well for this role and I am excited about the opportunity to put my skills to use.

I am particularly drawn to [Company’s] focus on [Specific Aspect of Company], and the impact that your work has on [Customer, Industry, etc.]. I am motivated by a desire to be a part of this work and contribute to its continued success.

Thank you for considering my application. Please feel free to contact me if you need any additional information or to discuss my qualifications further.

[Your Name]

B. Enclosure Example

Enclosures:

• Cover Letter
• Professional References

I am writing to express my interest in the [Position] role at [Company]. Enclosed, please find my resume, cover letter, and professional references that I have included for your review.

As a qualified [Industry] professional with [Number] years of experience, I am confident in my ability to make a valuable contribution to [Company]. I am excited about this opportunity to use my skills in [Skill 1], [Skill 2], and [Skill 3] to support your team.

Thank you for taking the time to review my application. Please feel free to contact me if you need any additional information or to discuss my qualifications further.

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What Does “Re:” Mean In a Letter? Explained With Examples

“Re:” is common in formal letters. You might have read one recently and wondered what it means. That’s okay because we’re here to help you understand it. You’ll know all about “re:” and how it works by the time you’ve finished this article.

What Does “Re:” Mean In a Letter?

Instead, we’re taught that formal letters or addresses work well if we can keep them short and to the point. That’s why using short forms like “Re:” for “regarding” works so well.

What Does “Re:” Mean In a Business Letter?

What does “re:” mean in a cover letter, what does “re:” mean in an email.

In an email, “Re:” can appear in the subject line to reply to a previous email. It can also be placed in the body of the email if there is something specific we are referring to from a previous point.

It’s most likely that you’ll come across “Re:” in the subject line when replying to other emails. Most email services do this automatically, so you don’t have to add it as an extra step.

Where Should I Place “Re:” In a Letter?

What is the difference between “re:” and “ref”.

“Re:” works in two ways. It can mean “regarding” or “referring to,” or it can be used to “reply” to someone. “Ref” is a much less common abbreviation, but you might see it in some formal letters. It only means “with reference to.”

Is “Re:” Formal?

“Re:” is formal. It’s an abbreviation, but we can use it formally when we want to remain sharp and to the point. Many formal writers like to do this because it helps readers to understand the main topic throughout their letters or emails.

If we don’t use abbreviations or keep our formal writing succinct, it can create problems for readers. If we make our writing overly confusing by including unnecessary words, most people will be put off by our unprofessional style choices.

Is It “Re:” or “Re”?

Is it “re:” or “re:”.

Martin holds a Master’s degree in Finance and International Business. He has six years of experience in professional communication with clients, executives, and colleagues. Furthermore, he has teaching experience from Aarhus University. Martin has been featured as an expert in communication and teaching on Forbes and Shopify. Read more about Martin here .

• Operating systems

When enterprise employees worked almost exclusively in company offices, they sat at desks and did their work on company-owned desktop computers. Now an employee's work moves with them from place to place. On laptops and tablets and phones. And very often, the work resides on devices the employees own. All this has shifted the work of the enterprise IT staff dramatically. This cavalcade of mobile devices and remote employees is one reason unified endpoint management came to be. In this guide, we look at what UEM can do, its main features, how to choose the right UEM product for your organization – and much more.

Operating system (os).

• Stephen J. Bigelow, Senior Technology Editor

What is an operating system?

An operating system (OS) is the program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface ( API ). In addition, users can interact directly with the operating system through a user interface, such as a command-line interface (CLI) or a graphical UI (GUI).

Why use an operating system?

An operating system brings powerful benefits to computer software and software development. Without an operating system, every application would need to include its own UI, as well as the comprehensive code needed to handle all low-level functionality of the underlying computer, such as disk storage, network interfaces and so on. Considering the vast array of underlying hardware available, this would vastly bloat the size of every application and make software development impractical.

Instead, many common tasks, such as sending a network packet or displaying text on a standard output device, such as a display, can be offloaded to system software that serves as an intermediary between the applications and the hardware. The system software provides a consistent and repeatable way for applications to interact with the hardware without the applications needing to know any details about the hardware.

As long as each application accesses the same resources and services in the same way, that system software -- the operating system -- can service almost any number of applications. This vastly reduces the amount of time and coding required to develop and debug an application, while ensuring that users can control, configure and manage the system hardware through a common and well-understood interface.

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Once installed, the operating system relies on a vast library of device drivers to tailor OS services to the specific hardware environment. Thus, every application may make a common call to a storage device, but the OS receives that call and uses the corresponding driver to translate the call into actions (commands) needed for the underlying hardware on that specific computer. Today, the operating system provides a comprehensive platform that identifies, configures and manages a range of hardware, including processors; memory devices and memory management; chipsets; storage; networking; port communication, such as Video Graphics Array (VGA), High-Definition Multimedia Interface (HDMI) and Universal Serial Bus (USB); and subsystem interfaces, such as Peripheral Component Interconnect Express (PCIe).

What are the functions of an operating system?

An operating system provides three essential capabilities: It offers a UI through a CLI or GUI; it launches and manages the application execution; and it identifies and exposes system hardware resources to those applications -- typically, through a standardized API.

UI. Every operating system requires a UI, enabling users and administrators to interact with the OS in order to set up, configure and even troubleshoot the operating system and its underlying hardware. There are two primary types of UI available: CLI and GUI.

The CLI, or terminal mode window , provides a text-based interface where users rely on the traditional keyboard to enter specific commands, parameters and arguments related to specific tasks. The GUI, or desktop , provides a visual interface based on icons and symbols where users rely on gestures delivered by human interface devices, such as touchpads, touchscreens and mouse devices.

The GUI is most frequently used by casual or end users that are primarily interested in manipulating files and applications, such as double-clicking a file icon to open the file in its default application. The CLI remains popular among advanced users and system administrators that must handle a series of highly granular and repetitive commands on a regular basis, such as creating and running scripts to set up new personal computers (PCs) for employees.

Application management. An operating system handles the launch and management of every application. This typically supports an array of behaviors, including timesharing multiple processes, or threads , so that various tasks can share the available processors' time; handling interruptions that applications produce to gain a processor's immediate attention, ensuring there is enough memory to execute the application and its corresponding data without interfering with other processes; carrying out error handling that can gracefully remove an application's processes; and performing memory management without disrupting other applications or the OS.

An operating system can also support APIs that enable applications to utilize OS and hardware functions without the need to know anything about the low-level OS or hardware state. As an example, a Windows API can enable a program to obtain input from a keyboard or mouse; create GUI elements, such as dialog windows and buttons; read and write files to a storage device; and more. Applications are almost always tailored to use the operating system on which the application intends to run.

Additionally, an operating system can perform the following services for applications:

• In a multitasking operating system, where multiple programs can be running at the same time, the OS determines which applications should run in what order and how much time should be allowed for each application before giving another application a turn.
• It handles input/output (I/O) to and from attached hardware devices, such as hard disks, printers and dial-up ports.
• It sends messages to each application or interactive user -- or to a system operator -- about the status of operation and any errors that may have occurred.
• It can offload the management of batch jobs -- for example, printing -- so that the initiating application is freed from this work.
• On computers that can provide parallel processing, an operating system can manage how to divide the program so that it runs on more than one processor at a time.

All major computer platforms (hardware and software) require, and sometimes include, an operating system, and operating systems must be developed with different features to meet the specific needs of various form factors.

Device management. An operating system is responsible for identifying, configuring, and providing applications with common access to underlying computer hardware devices. As the OS recognizes and identifies hardware, the OS will install corresponding device drivers that enable the OS and applications running on the OS to use the devices without any specific knowledge of the hardware or devices.

An operating system is responsible for identifying the correct printer and installing the appropriate printer drivers so that an application needs to only make calls to the printer without having to use codes or commands that are specific to that printer -- that is the operating system's job. The situation is similar for other devices, such as USB ports; networking ports; graphics devices, such as graphics processing units (GPUs); motherboard chipsets; and storage devices, such as Serial-Attached SCSI (SAS) disk adapters and disks that are formatted with a suitable file system.

The OS identifies and configures physical and logical devices for service and typically records them in a standardized structure, such as Windows Registry. Device manufacturers periodically patch and update drivers, and the OS should update them to ensure best device performance and security. When devices are replaced, the OS also installs and configures new drivers.

Operating system types and examples

Although the fundamental roles of an operating system are ubiquitous, there are countless operating systems that serve a wide range of hardware and user needs.

General-purpose operating system. A general-purpose OS represents an array of operating systems intended to run a multitude of applications on a broad selection of hardware, enabling a user to run one or more applications or tasks simultaneously. A general-purpose OS can be installed on many different desktop and laptop models and run applications from accounting systems to databases to web browsers to games. General-purpose operating systems typically focus on process (thread) and hardware management to ensure that applications can reliably share the wide range of computing hardware present.

Common desktop operating systems include the following:

• Windows is Microsoft's flagship operating system, the de facto standard for home and business computers. Introduced in 1985, the GUI-based OS has been released in many versions since then. The user-friendly Windows 95 was largely responsible for the rapid development of personal computing.
• Mac OS is the operating system for Apple's Macintosh line of PCs and workstations.
• Unix is a multiuser operating system designed for flexibility and adaptability. Originally developed in the 1970s, Unix was one of the first operating systems to be written in the C language .
• Linux is a Unix-like operating system that was designed to provide PC users a free or low-cost alternative. Linux has a reputation as an efficient and fast-performing system.

Mobile operating system. Mobile operating systems are designed to accommodate the unique needs of mobile computing and communication-centric devices, such as smartphones and tablets. Mobile devices typically offer limited computing resources compared to traditional PCs, and the OS must be scaled back in size and complexity in order to minimize its own resource use, while ensuring adequate resources for one or more applications running on the device. Mobile operating systems tend to emphasize efficient performance, user responsiveness and close attention to data handling tasks, such as supporting media streaming. Apple iOS and Google Android are examples of mobile operating systems.

Embedded operating system. Not all computing devices are general purpose. A huge assortment of dedicated devices -- including home digital assistants, automated teller machines (ATMs), airplane systems, retail point of sale (POS) terminals and internet of things (IoT) devices -- includes computers that require an operating system. The principal difference is that the associated computing device only does one major thing, so the OS is highly stripped down and dedicated to both performance and resilience. The OS should run quickly, not crash, and handle all errors gracefully in order to continue operating in all circumstances. In most cases, the OS is provided on a chip that is incorporated into the actual device. A medical device used in a patient's life support equipment, for example, will employ an embedded OS that must run reliably in order to keep the patient alive. Embedded Linux is one example of an embedded OS.

Network operating system. A network operating system (NOS) is another specialized OS intended to facilitate communication between devices operating on a local area network ( LAN ). A NOS provides the communication stack needed to understand network protocols in order to create, exchange and decompose network packets. Today, the concept of a specialized NOS is largely obsolete because other OS types largely handle network communication. Windows 10 and Windows Server 2019, for example, include comprehensive networking capabilities. The concept of a NOS is still used for some networking devices, such as routers, switches and firewalls, and manufacturers may employ proprietary NOSes, including Cisco Internetwork Operating System (IOS), RouterOS and ZyNOS.

Real-time operating system. When a computing device must interact with the real world within constant and repeatable time constraints, the device manufacturer may opt to use a real-time operating system ( RTOS ). For example, an industrial control system may direct the operations of a sprawling factory or power plant. Such a facility will produce signals from myriad sensors and also send signals to operate valves, actuators, motors and countless other devices. In these situations, the industrial control system must respond quickly and predictably to changing real-world conditions -- otherwise, disaster may result. An RTOS must function without buffering, processing latencies and other delays, which are perfectly acceptable in other types of operating systems. Two examples of RTOSes include FreeRTOS and VxWorks.

The differences between operating system types are not absolute, and some operating systems can share characteristics of others. For example, general-purpose operating systems routinely include the networking capabilities found in a traditional NOS. Similarly, an embedded operating system commonly includes attributes of an RTOS, while a mobile operating system can still typically run numerous apps simultaneously like other general-purpose operating systems.

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Medicare Supplement Insurance (Medigap) is extra insurance you can buy from a private insurance company to help pay your share of out-of-pocket costs in Original Medicare. What types of insurance aren’t Medigap?  

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In some states, you may be able to buy another type of Medigap policy called Medicare SELECT . If you buy a Medicare SELECT policy, you have the right to change your mind within 12 months and switch to a standard Medigap policy.    

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