The SMA Crossover Indicator is a popular and free forex indicator for the MetaTrader 4 platform. The indicator works by plotting two simple moving averages (SMA) on the chart, one with a shorter time frame and one with a longer time frame. When the shorter time frame SMA crosses over the longer time frame SMA, this indicates a potential entry point in the market. The SMA Crossover Indicator is a great tool for traders looking for a simple yet effective way to identify potential entry and exit points in the market.