This document provides an introduction to business law. It defines business law as the system of rules that governs business affairs and settles disputes. The document outlines the different branches of law including constitutional law, administrative law, criminal law, civil law, and commercial law. It also discusses sources of business law, legal positivism, cases of first impression, and legal reasoning. The purpose of government is defined as preventing crime and preserving contracts. The key differences between civil and criminal law are also summarized.