Generally speaking, the resume focuses on yourself and emphasizes what you have. The cover letter focuses on the other party and emphasizes what it will bring to the other party. Sometimes, job seekers sometimes do not mean that employers can get corresponding benefits. The function of a cover letter is to tell the other party how much benefits they will get from hiring themselves, so as to attract their attention, concern and goodwill, and thus stand out among hundreds of applicants. The quality of the cover letter will greatly affect the resume and function. A good cover letter can win you an interview, while a bad cover letter will cast a shadow over your resume.