What is Stop Loss used in the Commodity trading?

The safe guard of the money in online trading when the market goes in opposite trend, is Stop loss.
The price of the commodity always fluctuate in up and down movement and it is very difficult to predict the correct price from where the price increase or decrease. So, we can wait till some what price that will go in loss. That some what price is called as stop loss.
when you buy the crude oil in 5500 , the market should go up to get profit. If the market goes below 5500, the amount in your trading account will be automatically vanished. The experts in trading wait sometimes for the market change. So, they predict the some price to put the stop loss amount like 5480 and to cut the trade automatically.
Put stop loss to cut the loss overflow…………..!