The NIFTY option chain is the full table of call and put contracts listed on NSE for a given expiry, one row per strike. For each strike it shows the last traded price, implied volatility and open interest, with calls on one side and puts on the other and the at-the-money strike marked in the middle. Strikes below spot are in-the-money for calls; strikes above spot are in-the-money for puts.
NIFTY is the NSE benchmark of 50 large-cap stocks and carries the deepest option liquidity in India, so its chain is usually the cleanest place to read positioning. The chain is the raw source that every other page here is derived from: the NIFTY PCR is computed from its OI totals, the max pain strike from its OI payout curve, and the IV smile from its per-strike implied volatilities. Use the links above to jump between those views on the same underlying.