A bracket order is a combination of a Stop Loss order to reduce your loss and a book profit order to take profits. This is placed along with the main order in the same order form.
For example: You want to buy stock at Rs.500 and to reduce loss want place stop loss order Rs. 10 below LTP and want to book profit @ Rs514. To do so you can place a buy order at Rs.500 with a stoploss of Rs.10 and book profit as 514.
On scrips where Bracket Order is available on RYZ Trade(Gill Trade 2.0), the same will be available while placing order under product type.
Note - Bracket order is only for intraday trades only that to with in range mentioned when placing a order.