The Illinois Affidavit of Service — Special Process Server is a document that is used to legally serve court documents to a person or business in the state of Illinois. This document is signed by a Special Process Server, a person who is licensed and certified by the state to serve court documents. It is used by the court to verify that the documents were successfully delivered to the recipient. The Affidavit of Service — Special Process Server includes information such as the name and address of the recipient, the date the documents were served, and the manner in which they were served (in-person, by mail, etc.). There are two types of Illinois Affidavit of Service — Special Process Server: the Standard Form and the Joint Affidavit of Service. The Standard Form is used when a single recipient is being served, while the Joint Affidavit of Service is used when multiple recipients are being served.