Briefly describe the concept and function of criminal judgment documents.

Criminal judgment document refers to the effective document made by the people's court on the substantive and procedural issues of criminal cases in criminal proceedings. Criminal judgment documents are the main components of criminal litigation documents. Criminal judgment documents are not only powerful weapons for people's courts to exercise judicial power, apply criminal law, protect people and punish crimes, but also vivid teaching materials to publicize the legal system and educate citizens to abide by the law. Making criminal judgment documents is an important part of the criminal trial work of the people's courts and an important task of criminal judges.