Which best describes a "subpoena"?

A subpoena is a legal document that commands an individual to appear in court as a witness or to produce specified documents or evidence. This is crucial in the judicial process as it ensures that all relevant information is presented to the court. Subpoenas can be issued for various reasons, including gathering evidence for a trial, ensuring witness testimony, or compelling the production of documents that may be pertinent to a case.

In the context of legal proceedings, the ability to subpoena witnesses and documents is instrumental in establishing a case, allowing the court to access necessary information to make informed decisions. Understanding this definition highlights why the correct choice is the one identifying it as an order requiring testimony or documents.