An Illinois Subpoena is a legal document that is issued by a court in the state of Illinois. It is used to compel a person or entity to appear in court to give testimony or to provide documents, records, or other physical evidence that is relevant to a case. There are two types of Illinois Subpoenas: a Subpoena Ducks Cecum and a Subpoena Ad Testificandum. A Subpoena Ducks Cecum requires the recipient to produce documents, records, or other physical evidence, while a Subpoena Ad Testificandum requires the recipient to testify in court. Both types of Subpoenas must be served in accordance with Illinois law and can be enforced by the court if the recipient fails to comply.