In most cases, job seekers need a cover letter when applying for open vacancies, and it will make a really big difference in securing winning job interviews and having their application ignored by recruiters. Put enough time and effort in your cover letter sample resume attempts. To get your application chosen by hiring managers, learn the information necessary to win. Review helpful tips for: How to properly format your cover letter; What to include in it; Mistakes to avoid. What cover letters are Before you start writing anything, get familiar with the main purpose served by cover letters. They are important documents sent with resumes to provide hiring managers with extra data about work qualifications and skills. They also provide detailed information on why you’re qualified for the chosen job. Repeating your resumes in cover letters is a mistake.