A Subpoena to Appear and Testify at a Hearing or Trial in a Civil Action is a legal document issued by a court or other party involved in a civil action, such as a plaintiff or defendant, to a witness or other individual with relevant information. The Subpoena requires the recipient to appear in court at a specified time and place and to testify about any relevant evidence that he or she may have. There are two types of Subpoena to Appear and Testify at a Hearing or Trial in a Civil Action: a Subpoena ad Testificandum and a Subpoena Ducks Cecum. The Subpoena ad Testificandum requires the recipient to appear in court and testify about any relevant evidence that he or she may have. The Subpoena Ducks Cecum requires the recipient to appear in court and to bring any relevant documents or records with him or her to the hearing or trial. The purpose of requiring witnesses or individuals with relevant information to appear in court and testify is to ensure that all available evidence is presented in court and that justice is served. If the recipient of the Subpoena fails to appear in court as required, he or she may be held in contempt of court.