A cover letter makes the case for your match to a specific job or internship. While the resume summarizes your background and accomplishments.A cover letter is used to briefly expand upon the skills and experiences in your resume and to link them to the position that you are applying for. In this article, we share the steps for writing an application letter along with a template and an example for you to use when writing your own. Upload a cover letter from your computer or fill in a text-only cover letter below. File must be in PDF, DOC, DOCX, JPG, JPEG, PNG or BMP format. Lastname (or Position Title):. First paragraph: Explain why you are writing. Letter for Social Security Number Application Form. Start with their website, but don't stop there.