There are three major legal systems in the world: common law, civil law, and theocratic law. The document discusses the differences between common law and civil law systems, focusing on how common law emphasizes remedies while civil law emphasizes rights, the importance of precedent in common law versus written codes in civil law, and the adversarial versus inquisitorial approaches. The document also examines mixed legal systems and the sources of law they incorporate, such as common law, equity, statutes, sharia law, merchant law, and canon law. Public law governs relations between states and citizens, while private law regulates relations between private individuals and entities.