Topic: Trailing Stop.
A trailing stop is a type of stop-loss order attached to a TRADE that moves as price fluctuates.
Let's say that you've decided to short USD/JPY at 90.80, with a trailing stop of 20 pips. This means that originally, your stop loss is at 91.00. If price goes down and hits 90.50, your trailing stop would move down to 90.70.
Just remember though, that your stop will STAY at this price. It will not widen if price goes against you. Going back to the example, with a trailing stop of 20 pips, if USD/JPY hits 90.50, then your stop would move to 90.70. However, if price were to suddenly move up to 90.60, your stop would remain at 90.70.
Your trade will remain open as long as price does not move against you by 20 pips. Once price hits your trailing stop, a stop-loss order will be triggered and your position will be closed.