What is criminal defense and what kinds are there?

Legal analysis: According to the provisions of China's Criminal Procedure Law, criminal defense is defined as: criminal defense refers to the litigation activities in which the criminal suspect, the defendant and their defenders present evidence and reasons in favor of the defendant according to facts and laws, indicating that the defendant is innocent, the crime is light or should be mitigated or exempted from punishment. Based on the legal right of defense, defense is a basic litigation function, which is put forward and opposed to complaints. No charges, no defense. Only after the defendant is accused can the defendant and his defender defend. The types of criminal defense are: 1, justifiable defense, that is, the defense conducted by the suspect and the defendant themselves; 2. Entrusted defense, that is, the criminal suspect entrusts a lawyer or a close relative to defend; 3. Designated defense, that is, the defendant who may be sentenced to life imprisonment or death, or the defendant is blind, deaf, dumb or with limited capacity, and has not entrusted a defender, the court shall appoint a lawyer to defend him. According to the defense direction, it can be divided into: innocence defense, misdemeanor defense and accusation defense. Legal basis: Article 33 of the Criminal Procedure Law of People's Republic of China (PRC) stipulates that a criminal suspect or defendant may entrust one or two persons as defenders in addition to exercising the right of defense. The following persons may be entrusted as defenders: (1) lawyers; (2) A person recommended by a people's organization or the unit to which the criminal suspect or defendant belongs; (3) Guardians, relatives and friends of criminal suspects and defendants. A person who has been sentenced to punishment according to law or deprived of or restricted personal freedom shall not act as a defender. A person who has been dismissed from public office or has his lawyer's or notary's practice certificate revoked may not act as a defender, except the guardian or near relative of the criminal suspect or defendant. Article 37 of the Criminal Procedure Law of People's Republic of China (PRC) stipulates that the duty of a defender is to provide materials and opinions on whether a criminal suspect or defendant is innocent, light or relieved of criminal responsibility according to facts and laws, and to safeguard the litigation rights and other legitimate rights and interests of the criminal suspect or defendant. Article 45 of the Criminal Procedure Law of People's Republic of China (PRC) stipulates that during the trial, the defendant may refuse the defender to continue to defend him or entrust another defender to defend him.