This document provides an introduction and overview of law. It discusses the evolution of legal systems from primitive societies to modern democracies. It defines law and explains why law is important in regulating society. The document outlines different legal systems, including common law and civil law systems. It also discusses purposes of law such as human protection, cooperation, regulating institutions, and creating a peaceful and prosperous society. Dispute resolution methods like adjudication and alternative dispute resolution are also summarized.