A contract is any legally-enforceable promise or set of promises made by one party to another and, as such, reflects the policies represented by freedom of contract. In the civil law, contracts are considered to be part of the general law of obligations.

Corporations law or corporate law is the law concerning the creation and regulation of corporations. A corporation is a group of people which are legally treated as a person; the corporation can own property, sign contracts, sue, and be sued. Corporate law refers to the law governing the relationships among shareholders and management.

Deals with the relationships between states, or between persons or entities in different states. It sub-divides into "public international law", and "private international law". When used without an adjective, "international law" generally refers to "public international law", and this article concentrates on that meaning.

The codified system of laws that describes government levies on economic transactions, commonly called taxes.