What It Means
LTP (Last Traded Price) is the price at which a stock, future, or option contract's most recent trade actually executed on the exchange, not the price someone is currently offering to buy or sell it at. It's the number flashing on the option chain's price column, and it only updates when a real trade prints, not continuously.
Warning
On a thinly traded strike, LTP can be stale. The last trade might have happened minutes ago at a price nobody's currently willing to deal at. Check the bid-ask spread alongside LTP before assuming you'll get filled anywhere near it.