In this guide, we will discuss the importance of a cover letter and provide you with tips and tricks to help you craft an effective one. Study this sample cover letter and explore the dropdowns below to learn how to craft a quality document.What is the Purpose of a Cover Letter? The purpose of the cover letter is to gain the interest of an employer and be invited to an interview. I am writing to express my interest in the ABC position at XYZ Company. This letter is especially helpful if you're applying to a traditionally unrelated industry from your previous job. It does the following:. A cover letter should indicate that you have a clear understanding of your career goals and job objectives. I am writing to express my interest in the ABC position at XYZ Company. The most important aspect of the cover letter is your focus on the employer.