The expiry date is the specific future date on which a Futures or Options contract settles, after which the contract ceases to exist in that specific series. In India, monthly contracts typically expire on the last Thursday of the expiry month, subject to exchange rules — always confirm the exact date live, as holidays and exchange notices can shift it.
Related Reading
See how expiry fits into the full Futures contract structure in What Is a Futures Contract? A Complete Beginner’s Guide.