A trailing stop is a stop loss that moves up higher as the price of the instrument does. It allows a trader to continue to profit if the market continues in their favoured direction, but which automatically protects their trade if the price moves in the opposite direction.
Please note. However, that trailing stops do not sit on our trading servers. This means that (like an expert advisor listed above) your platform will need to be open and constantly connected to the internet for them to be triggered.