Craft an outstanding Bank Teller cover letter. A reader just sent me a cover letter that I can't resist posting, especially because it comes with a "before" version and the "after" version she created.What do I write in a cover letter? Professor Heather Austin What Is a Cover Letter? A cover letter is a short letter written directly to the person who will read your job application and resumé. Craft an outstanding Bank Teller cover letter. Cover letters showcase your interest in the position and company. Mention where you found the job posting and why you are interested in the role. Research the company and include keywords used in the job description.