An Illinois Subpoena For Deposition is a legal document issued by a court in the state of Illinois. It commands the recipient of the document, known as the deponent, to appear in court at a specified time and date and testify under oath in a deposition. The deposition is taken in the presence of a court reporter who records the testimony. The purpose of a deposition is to allow the parties involved in a lawsuit to gain information that would otherwise be difficult to obtain. There are two types of Illinois Subpoena For Deposition: a simple subpoena and an independent subpoena. A simple subpoena is issued by the court to the deponent, and requires the deponent to appear for the deposition. An independent subpoena is issued directly to a third-party witness or to a document custodian, and requires the production of documents or other tangible evidence for the deposition.