A contract is an agreement between two or more persons (individuals, businesses, organizations or government agencies) to do, or to refrain from doing, a particular thing in exchange for something of value. Contracts generally can be written, using formal or informal terms, or entirely verbal. If one side fails to live up to his/her/its part of the bargain, there's a "breach" and certain remedies for solving the differences are available. The terms of the contract - the who, what, where, when, and how of the agreement - define the binding promises of each party to the contract.