A trading account is an account a broker provides you to transact (buy or sell) shares during market hours. When you BUY security, the money is debited from your bank account, and the shares are credited in your Demat account on T+2 days. Similarly, when you SELL your shares through a trading account, the same gets debited from your Demat... account and are then sold in the market. The proceeds of this sale are credited to your bank account. Thus, to trade in the stock markets, it is mandatory to have both a Demat as well as a trading account.+ More
