An Illinois Affidavit of Service is a sworn statement, usually notarized, that is used to prove that a document was served in accordance with Illinois law. This type of affidavit is commonly used in civil court proceedings and is typically required by the court to demonstrate that the papers were properly served. The affidavit must be completed by the person who served the documents, and it must include the date and time of service, the method of service, the name and address of the person served, and the name and address of the person who served the documents. There are two main types of Illinois Affidavit of Service: Personal Service and Substitute Service. Personal Service is when the papers are served directly to the person, either by hand or by mail. Substitute Service occurs when the papers are served to someone else of suitable age and discretion, such as an adult family member or employee of the person to be served.