Intraday trading, also called day trading, is the buying and selling of stocks and other financial instruments within the same day. In other words, intraday trading means all positions are squared-off before the market closes and there is no change in ownership of shares as a result of the trades.
There's only one difference between a regular trade and intraday trade. It lies in taking the delivery of the stocks.

In intraday trading, you square-off your positions the same day. So, your sell order offsets your buy order. This way, there is no transfer of ownership of shares. A regular trade gets settled over a span of days if not longer. So, you get delivery of the shares you bought while the shares you sold move out of your demat account.

https://www.kotaksecurities.com/ksweb/intraday-trading/intra...