This document provides an introduction to business law. It defines law and explains the need for laws in society to regulate behavior. The main branches of law are described as constitutional law, administrative law, criminal law, civil law, and commercial law. Sources of business law and key legal concepts such as legal positivism, legal realism, stare decisis, precedent, and civil vs. criminal law are also outlined. The document concludes by noting many areas of business are regulated by laws relating to contracts, disputes, and more.