A New York Affidavit of Service is a document used in the state of New York to prove that a legal document, such as a summons or complaint, was served on a party. The Affidavit of Service must be completed by the individual responsible for delivering the document, and must include the date, time, and manner in which the document was served. It is then signed and notarized to make it legally binding. There are two types of New York Affidavit of Service: Personal Service and Substitute Service. Personal Service requires the document to be served personally to the party by a third party, such as a process server. Substitute Service requires the document to be left with someone of suitable age and discretion who resides in the same household as the party.