Customize each résumé and cover letter to respond to the specific job opening for which you're applying. Purpose of a Cover Letter.It is your introduction to the employer and an opportunity to state your interest in the position and the company. Do your research and personalize your cover letter. Cover letters should be one page in length, and three to four paragraphs long. A list of cover letter examples in different industries. Each template includes a brief analysis to help you get ideas on what to write for your application. Get started on your cover letter and reference page materials using these examples to apply tips on formatting, structure, and content. If so, we recommend checking out our sample cover letters, to make sure your application is fully covered. A cover letter is submitted with a job application and resume explaining the applicant's credentials and interest in the open position.