Why a killer cover letter is important

It tells the employer who you are and why they want you.
It showcases your ability to write clearly and professionally—an important skill in nearly every job.
It shows that you are serious about the opportunity and introduces you as a dead-on match; it shows genuine interest in the company and position, which can set you apart from others who may seem less invested.
Your resume is factual, your cover letter is personal.
It’s a solid close.