The Momentum Divergence Indicator is a useful and popular free Forex indicator for MT4. It is used to identify divergences between price and momentum, which can be used to identify potential reversals in the market. The indicator works by plotting the difference between the current price and the momentum of the price. When the price is rising but the momentum is falling, it can be an indication that the trend is about to reverse. The Momentum Divergence Indicator is a powerful and reliable tool for traders looking to identify potential reversals in the Forex market.