Short selling means selling first and buying later, to profit from a fall in price. In the Indian cash market, retail traders can short a stock only intraday: you sell in the morning and must buy back before the close, or the broker squares off the position. If you hold a short overnight in the cash segment without delivering shares, it goes to auction and you pay a penalty. Suppose you sell 100 SBI shares at ₹800 at 10 AM expecting weakness, and buy them back at ₹792 by 2 PM; the gross gain is ₹800. If SBI instead rallies to ₹815, the loss is ₹1,500. For multi-day short positions, traders use futures or buy put options instead. The risk in shorting is that a stock can rise without limit, so a stop loss is essential, and short squeezes on good news can be violent.