A cover letter is a document you send along with your resume to a company when you are applying for a job to highlight your skills and experiences.

The cover letter provides information to the employer about who the candidate is as a professional and as a person. This includes their areas of interest, professional goals, knowledge, skills ...

And cover letter writing, like resume writing, is a unique form of writing. It is essentially a marketing piece or a sales pitch-- not the type of writing even most professional writers do with ease.