Stop" and "stop loss" are synonymous. A "stop" literally stops the loss. If a stock or option hits your specified price, then you are "stopped out" - the position is closed. Stops can also be used to make money. A "trailing stop" can allow you to remain in a winning trade longerbecause your stop loss literally trails the price. As the price moves higher, the stop level also moves higher. You remain in the position until the price retreats enough to trigger your trailing stop. Your profit is then taken and you've exited the trade. These videos explain stops in detail.