Cover Letter

Let's begin by saying that a cover letter is a document sent with your resume to provide additional information on your skills and experience. It typically provides detailed information on why are you are qualified for the job you are applying for. Effective cover letters explain the reasons for your interest in the specific organization and identify your most relevant skills or experiences.

http://www.highere.com/why-cover-letter-is-so-important-and-how-can-i-create-a-powerful-cover-letter/

This first website would explain the importance of a cover letter and also it would shows how to create one.

http://www.morningside.edu/student_life/careers/sampleletter.cfm

The 2nd  lwebsite shows you six different samples of a cover letter. In the 1st sample you explain the requirements and qualifications, the 2nd one you describe your experiences, and so on.

http://jobsearch.about.com/od/coverlettersamples/a/coverlettsample.htm

The above 3rd website will take you to see many different cover letters according to your career.

All these three websites will give you a better idea of why we need a cover letter along with our resume. They will also explain how to create a cover letter according to your career and they will show you many different samples.