An Illinois Subpoena is a legal order issued by a court in the state of Illinois that requires a person or entity to provide evidence in a legal proceeding. Illinois Subpoenas may be issued for a variety of purposes, including requiring a witness to appear in court, compelling a party to produce documents or other tangible evidence, or requiring the production of financial records. There are two types of Illinois Subpoenas: a Subpoena Ducks Cecum and a Subpoena Ad Testificandum. A Subpoena Ducks Cecum is a court order that requires a party to bring tangible evidence to court, such as documents or other objects. A Subpoena Ad Testificandum is a court order that requires a witness to appear in court and testify under oath. Both types of Illinois Subpoena must be served on the party being requested to provide evidence.