Legal analysis: 1. Civil litigation agents serve as plaintiffs, defendants, and third parties in civil cases based on the entrustment of the parties or direct provisions of the law. They have a wide range of responsibilities and can carry out various litigation actions within the scope of agency authority; 2. Criminal defenders are limited to defendants in criminal cases, and are created based on the defendant's entrustment or the designation of the court, and their responsibilities are relatively simple.
Legal basis: Article 37 of the "Criminal Procedure Law of the People's Republic of China": Based on the facts and the law, the defender submits materials that prove that the criminal suspect or defendant is innocent, the crime is minor, or the criminal liability is reduced or exempted. and opinions, and the responsibility to safeguard the litigation rights and other legitimate rights and interests of criminal suspects and defendants.