As the name suggests day trading or intraday is kind of trading style in the market . We will try to understand with an example : Let us suppose you came to know a news which have an impact on a specific stock now you decided to buy that stock assume PNB (punjab national bank) current market price Rs. 85 , now it has increased within market hours that day to Rs. 90, so when you execute the trade you choose MIS (Margin Intraday Square up) it means that whether you have profit or loss it will get squared off within market hours . As in case it went up, now the difference between your buy price and sell price will be your profit. So Rs. 5 will be your profit per share . Day or Intraday trading Margin .