T+1 settlement means that when you trade on day T, the shares and the money are exchanged on the next working day. India moved fully to T+1 in January 2023, ahead of most major markets, and optional T+0 settlement has been introduced for some stocks. If you buy 10 SBI shares on Monday, they are credited to your demat account on Tuesday; if you sell, the money becomes fully withdrawable on Tuesday, though brokers usually let you use most of it for further trades immediately. Settlement matters for corporate actions: to receive a dividend you must own the shares before the record date, which means buying at least a day earlier. Selling shares you bought the same day is intraday, not delivery. Selling delivery shares before they are credited, called BTST, carries a small risk of short delivery and auction penalties.