Definition
Law is the body of rules that a community treats as authoritative and enforces through recognized institutions. It defines what conduct is permitted, required, or forbidden, and it provides procedures for resolving disputes and assigning consequences.
Across history, law has taken many forms: ancient written codes such as those of Mesopotamia, religious law, customary law passed down orally, and the elaborate statutory and constitutional systems of modern states. What unites them is the claim to bind members of a society, not merely advise them.
Why it matters
How it works
A legal system requires rules, institutions to make and interpret them, and means to enforce them. Rules may originate from legislatures, courts, custom, or religious authority. Courts apply rules to particular disputes, and enforcement bodies give judgments practical effect. A recurring achievement in legal history is the idea that the law should apply consistently and that even those who govern are subject to it — a principle that constrains arbitrary rule. Legal systems also change, as new circumstances, values, and movements push lawmakers and judges to revise old rules.