Trading of shares in a stock exchange takes place through Registered Stockbrokers,the buyer places an order through the broker where the broker transfers the order to exchange where it is executed they choose stock trading to make money out of it.some see it as an option of saving or investment.The order needs to be placed using DEMAT account with the details on the share price, quantity and buy or sell order.The most common types of orders are market orders, limit orders, and stop-loss orders.an order is valid for a day or ioc.