This document provides notes on contract law in India. It defines a contract and classifies contracts according to validity, formation, and performance. It discusses voidable, void, illegal, and unenforceable contracts. Contracts are also classified as express, implied, quasi, and e-commerce. Executed, executory, unilateral, and bilateral contracts are defined. The essential elements of a valid contract are also outlined, including offer and acceptance, lawful consideration, capacity and consent of parties, lawful object, and certainty. Key rules regarding offers and acceptances are explained.