Definitions for "thank-you letter"
an essential follow-up step to an interview
an essential tool that lets the employer know you are still interested in the job and allows you to use the information you learned in the interview to sell yourself one more time
a quiet, thoughtful message that will make your reader feel appreciated
Keywords:  letter, length, written, format, short
a short document (under one page in length), often written in a similar format to a cover letter