After the service has been completed, the process server must provide an affidavit of service, also known as a proof of service or return of service. This document contains essential information such as the date, time, and location of the service, as well as the method used and a description of the person served. The affidavit of service is filed with the court as evidence that the legal documents have been properly served, and it plays a crucial role in ensuring that the legal proceedings can move forward.