The ZeroLag MACD Indicator is a popular and free Forex indicator for MT4 that is useful for traders of all levels. The indicator works by combining two moving averages with a histogram to provide a visual representation of the current trend. The histogram shows the difference between the two moving averages, and when the histogram is positive, it indicates an uptrend and when it is negative, it indicates a downtrend. The ZeroLag MACD Indicator is easy to use and provides traders with a reliable signal that they can use to make informed trading decisions.