Promissory Estoppel

Promissory estoppel is the legal principle that a promise is enforceable by law, even if made without formal consideration when a promisor has made a promise to a promisee who then relies on that promise to his subsequent detriment. Promissory estoppel is intended to stop the promisor from arguing that an underlying promise should not be legally upheld or enforced. The doctrine of promissory estoppel is part of the law in the United States and other countries, although the precise legal requirements for promissory estoppel vary not only between countries but also between different jurisdictions, such as states, within the same country.