It's to the advantage of both parties to use a recommendation letter. This gives a job seeker an edge, and it provides hiring managers with a better idea upfront about the person professionally.

Letters of recommendation are an integral part of the college application process, offering admissions committees a more complete analysis of an applicant’s potential beyond academic performance.

Recommendation letters are a critical piece of your application. A strong letter of recommendation from several (at least three are needed) of your peers is just as important to your graduate school ...