What is Subpoena?

A subpoena is a formal written order that requires a person to appear before a court, or other legal proceedings (such as a Congressional hearing), and testify, or produce documentation.
In U.S. Law, “subpoena” from the Latin term meaning “under penalty,” is a written document and command from the courts requiring a person to take a certain action like appearing as a witness or handing over a piece of evidence.
Attorneys use subpoenas to get the information required to prove or disprove the claims presented in both civil and criminal cases.
a subpoena compels action by an individual or entity. a warrant authorizes action by a legal authority.