The Trend Bands Indicator is a popular and useful Forex indicator for the MT4 trading platform. It is a free indicator that helps traders identify strong support and resistance levels on their charts. It works by plotting two bands around a moving average line. The upper band is a resistance level and the lower band is a support level. When the price approaches one of these bands, traders can identify potential entry and exit points. It is also helpful in determining the strength of a trend, as well as providing an indication of when a trend may be reversing.