Do I need to write a cover letter?

You can't imagine how important a cover letter can be. The cover letter should be brief and to the point. It should concisely point out all the qualities the employers advertised for. In other words it's a teaser to get the hiring manager to open our resume and not hit the delete button!And don't send the cover letter as an attachment. The text in the body of your email should be your cover letter. It's one less step for the hiring manager to get one step closer to reading your resume.