Aug 12, 2018 - 06:45 AM
A cover letter gives you the opportunity to explain your resume. For instance, you can mention that you have a gap in your work history because you were taking care of a sick relative. It lets you detail an award or honor you received since a hiring manager is unlikely to look it up.
It also allows you to shine a spotlight on the aspects of your resume that best fit the position. If hiring managers skip a strength of yours, wouldn't you like to be able to draw their attention to it? Your cover letter lets you explain why hiring you benefits your potential employer.
Finally, keep in mind that this may be a test. A clever hiring manager might make a cover letter optional to measure initiative or desire for the position. Including one can set you apart from applicants who choose not to write it.