I always thought my resume was enough, but after sending out over 100 applications with no luck, I knew something was missing. Turns out, a good cover letter can significantly increase your chances of landing an interview. This article https://www.robinwaite.com/blog/how-a-cover-letter-can-help-you-beat-out-98-of-other-candidates breaks it down perfectly. It explains why hiring managers actually read cover letters and how they can make you stand out in a crowded job market. After following the advice in this article, I finally started getting interview calls!