The main reason why stop loss is used is to first ensure that bad trading does not get worse. Also, this is used to protect our equity. One more reason is that we will not always be in a trading terminal observing our trade so that stop loss will automatically stop our trading at a level that we consider quite bad. and Usually a stop loss is set below the level that once a broken price slips faster, and if we trigger a stop loss, it will let us enter at a more attractive level so that it reduces losses and changes trading in profits faster.