The MACD Momentum Indicator is a popular and free Forex indicator for MT4 that is useful for traders in determining momentum in the market. The MACD Momentum Indicator uses the MACD line and the signal line to determine whether the market is in a bullish or bearish trend. The MACD Momentum Indicator also uses a histogram to display the difference between the MACD line and the signal line. The MACD Momentum Indicator is useful for traders as it can help them identify potential trading opportunities in the Forex market.