This document defines consideration and its essential elements under contract law. Consideration is something of value that is exchanged between parties to a contract, such as money or goods. It must move from the promisee or third party at the desire of the promisor. While consideration is generally required for a valid contract, there are some exceptions, such as natural love and affection between relatives, compensation for past services rendered, or promises to pay time-barred debts in writing. The doctrine of promissory estoppel also allows aggrieved parties to recover damages resulting from reasonable reliance on a significant promise.