A cover letter is a single-page letter that should be part of any job application.
A cover letter is a document sent with your resume to provide additional information on your skills and experience.
The document typically provides detailed information on why you are qualified for the job in which you are applying for. A cover letter typically complements each resume you send out.
Your cover letter may make the difference between obtaining a job interview or having your resume ignored, so it makes good sense to devote the essential time and effort to writing an effective cover letter.
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