A contract is a legally binding exchange of promises or agreement between parties that the law will enforce. Contract law is based on the Latin phrase pacta sunt servanda (pacts must be kept).
Bilateral and unilateral contracts
Contracts may be bilateral or unilateral. The more common of the two, a bilateral contract, is an agreement in which each of the parties to the contract makes a promise or promises to the other party. In a unilateral contract, only one party to the contract makes a promise. …
