A great cover letter should do several things.
First, it should make a fantastic first impression—and fast. After all, this is often the very first interaction you’ll have with the person reading your job application.
Secondly, you’ll want to make it clear why you’re applying to this job, not any other one you found on the internet. Because, like anyone, hiring managers like to feel like you’ve put some time and effort into them.
And finally, you should show that you’re the person who can come right in and meet the company’s needs.