LTP, the last traded price, is simply the price of the latest transaction in a stock or contract. It is what apps display in big numbers and what news channels quote. It is not necessarily the price you will get. If SBI's LTP is ₹800.10 but the best bid is ₹800 and the best ask is ₹800.20, a market buy fills at ₹800.20 and a market sell at ₹800, not at the LTP. In an illiquid stock or option, the last trade may have happened minutes ago, and the current bid and ask can be far away from it. LTP also differs from the closing price, which on NSE is the weighted average of the last thirty minutes of trading. When judging what a position is worth or whether a stop will fill, look at the bid and ask and the order book, not only the LTP.