The Aroon Indicator is a popular and free Forex indicator used in the MT4 platform. It is a useful tool for traders as it helps identify potential trend reversals and breakouts. It then creates two lines, one for the highs and one for the lows, which are then used to measure the strength of the trend. The Aroon Indicator is easy to interpret, as the lines move closer together, the trend is considered to be weak. Conversely, if the lines move further apart, the trend is considered to be strong. Traders can use this information to make informed trading decisions, such as entering and exiting trades.