What are the main parts of a cover letter and their purposes?

Answer:

The heading gives the applicant’s contact information, the date, and the employer’s contact information. The introduction identifies the position and explains why the applicant is writing. The argument connects the applicant’s skills and experience to the employer’s needs and supports the applicant’s qualifications. The closing thanks the reader, expresses interest in an interview or follow-up, and ends with a professional sign-off.