The Average True Range (ATR) is a measure of volatility introduced by Welles Wilder in his book, 'New Concepts in Technical Trading Systems'. ATR is commonly used by many traders to determine the best position for their stop loss order as it correspond to the actual Forex market volatility. When the Forex market is volatile, traders look for wider stops in order to avoid being stopped out of the trading by some random market noise. When the volatility is low, there is no reason to set wide stops; traders then focus on tighter stops in order to have better protections for their trading positions and accumulated profits.