Common law is law developed through court decisions rather than enacted only through statutes or regulations.
Why common law matters
Common law matters because many legal rules are shaped by how courts decide real disputes over time. When a statute does not answer every detail, courts often look to earlier decisions, legal principles, and reasoning from similar cases.
This makes common law especially important in areas such as contracts, torts, property, and remedies, where courts often refine standards case by case.
Where common law appears
Common law appears in court opinions, legal arguments, jury instructions, and judicial rulings. Lawyers and judges may cite common-law rules when a dispute turns on concepts such as negligence, duty, breach, causation, or damages.
In the United States, common law usually works alongside statutes and regulations rather than replacing them.
Practical example
A person sues after being injured by another person’s careless conduct. The general negligence framework may come from common-law decisions, while a specific statute may add rules for a particular setting.
How common law differs from nearby terms
Common law differs from a statute because a statute is enacted by a legislature. It differs from a regulation because a regulation is issued by an administrative agency. It differs from case law because case law is the body of written decisions; common law is the legal rule system that those decisions help create.
Related terms
Quick knowledge check
If a rule comes mainly from court decisions rather than a legislative code, what kind of law is it?