Simply put a Cover Letter covers your profile and acts as an introductory bridge to a prospective recruiter or employer. (resumebuilder.isourcecorp.com)
Ask if you can send your profile with a cover letter of who you are and information on your agency. (americaadopts.com)
It's something you don't feel you have at first when everything is written in letters you can't read. (seitanismymotor.com)