What is a court document that orders a person to appear in court as a witness called?

A court document that orders a person to appear in court as a witness is referred to as a subpoena. This legal instrument compels the individual to testify or produce evidence relevant to a case. Subpoenas are essential in the judicial process, as they ensure that witnesses can be called upon to provide truthful testimony that supports the pursuit of justice.

In comparison, a warrant is typically issued for the arrest of an individual, an affidavit is a written statement confirmed by oath, often used as evidence in court, and a testimonial refers to the account or evidence given by a witness during a trial. The primary focus of a subpoena is its function to mandate attendance in court, underscoring its crucial role in legal proceedings.