The function of the criminal lawyer and the specifics of the criminal case should be explained within the scope of the Turkish Criminal Code. In fact, all lawyers can work as criminal lawyers because they do not have to specialize in Turkey. The lawyers mentioned as criminal lawyers are self-developed lawyers in this field. A criminal lawyer is a person who provides legal assistance to persons under suspicion of a crime during the stages of investigation initiated after the commission of a criminal act and prosecution, which begin with the adoption of an indictment. The reason why criminal cases are so important is that people who commit crimes are likely to have their freedom restricted and economically damaged at the end of the trial.