Are cover letters important?
They communicate a level of effort beyond simply submitting a predeveloped non-personalized resume.
To get your enclosed resume read and to generate interviews. Not including a cover letter with your resume, even when you submitted it online, is passing up a key opportunity to sell your skills. A cover letter allows you to direct the reader’s attention to aspects of your resume that are most relevant, demonstrate your knowledge of the company or organization you’re writing to and explain any part of your work history that needs clarification.