What do you mean by Sell stock? OR Short a stock in Intraday?

Many a times newbies find it difficult to understand the Sell or SHORT transaction. It is common to think that how can a sell take place even before a buy trade. The answer is YES- In day trading it is possible to profit from the market even if the market or stock is declining. E.g. Consider the stock SBI. The market condition is poor and you think that the stock wil definitely go down. Current value of SBI is 300 INR. You surely think that SBI might go down till 290 INR. So you can actually place a SELL order at INR 300. Please note you have placed the SELL order first. (And it is allowed). Now anybody profits only when he/she buys a stock at a lower value and sells the stock at a higher value. We are doing the same. We placed a SELL order first and now we are going to buy it at a lower price. So Person A sets a BUY order at INR 300. As expected price of SBI goes down to 290 and his BUY order gets executed. He earns a profit of 10 Rs. The above transaction is called shorting a stock. This is applicable to Futures, Options and Cash segments.