One of the most common questions we receive is whether to send a cover letter or not. There's a simple answer. Anytime you send your resume you should include a cover letter. Even if you're sending your resume via an online application, e-mail or through the mail (yes, believe it or not, that still happens from time to time).
No matter what name the potential employer gives it: letter of introduction, letter of intent, and others; it's still a cover letter.
The purpose of the cover letter is to make an introduction and to entice the reader to read your resume. You can also use the cover letter to address any potential red flags, such as a gap in employment or a drastic change in your career path.
Always make an effort to identify the person that will be receiving your resume - stay away from "To Whom It May Concern:" when possible.
Express your interest in learning more about the company or position.
Reiterate a specific success you've had in your career that matches something the employer is looking for.
Lastly, be sure to include your phone number and e-mail address, and that it matches what is on your resume.