Doctrine of Promissory Estoppel is applied when a party endures loss and some kind of damage in reliance of the promise by the other party. The consideration is absent from the promise and detrimental reliance was shown by the party facing loss. It is applied to legally bind promissor on their promise and defend the promisee. Promissory Estoppel is an equitable Doctrine and is not a contract neither an estoppel. It was developed to prevent unfairness. This paper will explore the Doctrine of Promissory Estoppel and its origins, history and applicability under both Common law and Indian law. Also, the essay will establish that Promissory Estoppel is available against private individuals in India.