An order to buy or to sell a currency when the currency’s price reaches or passes a specified level. A stop order is used in two ways. On some FOREX trading platforms, the stop order is used to set the stop loss on an active trade. Another way that the stop order is used is to take advantage of price breakouts. By setting a stop order beyond a key level (above the resistance for long trades and below the support for short trades), the trader can take advantage of a break of these key levels when if he is not sitting in front of his computer.