A job cover letter is a document that an individual writes to accompany their resume or CV when applying for a job. It serves as an introduction to the applicant and provides more information about them, their skills, experience, and qualifications relevant to the position they are applying for. The purpose of a cover letter is to persuade the employer to consider the candidate for the job by highlighting why they would be an asset to the company. It also demonstrates the applicant's written communication skills and can provide additional information that may not fit on their resume or CV, such as explaining gaps in employment or providing examples of relevant achievements. Overall, a well-written cover letter can help set an applicant apart from other candidates and increase their chances of getting hired for the job they want.