This document summarizes the purpose and functions of the criminal justice system. It discusses competing views of the criminal justice system's purpose as either crime control focused on effectively punishing criminals, or due process focused on protecting individual rights and limiting state power. It notes these are not mutually exclusive views but represent different emphases. The criminal justice system can be understood as a set of social institutions that regulate behavior through sometimes coercive means, within procedural limits aimed at protecting individuals. Overall the document provides context around debates about balancing crime control and due process in the criminal justice system.