Service means giving legal notice to the other party (or parties) that you have filed court papers. You must provide proof of service to the court.An affidavit of service, also sometimes called a proof of service affidavit, is a type of affidavit that relates to legal documents that are filed with a court. Once the papers have been properly served, the process server files an affidavit called "return of service' with the court. Step 3: Prepare to file the Affidavit with the court. • Complete the Affidavit. Affidavit of service meaning is a document that process servers provide to prove they have successfully served legal process. "Service" is the technical name for the other party receiving the documents that you filed. An affidavit of service is a sworn legal document confirming that specific legal papers were delivered to the intended recipient. Constable , sheriff, or process server; an affidavit of service must be filed with the court within 45 days.