Some employers are not keen on cover letters, while others look for cover letters when you apply for a job with them. However, the best practice is to submit a cover letter with your resume, even if they do not ask for it. Even though recruiters most often might not go through cover letters, they usually check one when they are unsure about a candidate. A cover letter can make a huge difference and influence the decision in favor of a candidate in such cases. That is, a cover letter has the potential to set you apart from the crowd.