The document discusses key concepts related to contracts under Indian law including:
1. A contract is defined as an agreement enforceable by law, which requires an offer, acceptance, intention to create a legal relationship, consideration, capacity to contract, and free consent.
2. There are various types of valid and invalid contracts. Valid contracts include absolute, contingent, express, and implied contracts. Invalid contracts include void, voidable, illegal, and unenforceable contracts.
3. Essential elements for a valid contract include offer and acceptance, intention to create a legal relationship, consensus ad idem, consideration, capacity to contract, free consent, legality of object, and possibility of performance.
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