Short for within the day, the term refers to securities traded on the markets during regular business hours. Day traders and scalpers who place many trades during a single trading session pay close attention to intraday price changes, as well as the bid-ask spread. When the market ends, intraday traders will close out all of their positions. Because of the limited time available to them, precise entries and exits, as well as the price paid to trade, is essential for the success of their trades.