Many people think cover letters are optional.
The smartest job seekers know that that writing a cover letter brings two big benefits:
1. For your prospective employer, it shows that you’re a serious candidate; the extra effort evinces your work ethic.
2. For yourself, writing a cover letter helps you develop the talking points you’ll need for an interview. After all, you’ll need these key messages at some point; why not get a head start?