Moving average convergence divergence (MACD) is a trend-following momentum oscillator that consists of three indicators: (1) a 12 period short-term exponential moving average (EMA) a 26 period long-term EMA and a 9 period EMA signal line. Traders using MACD often look for signal line crossovers, centerline crossovers, and EMA divergences to indicate the momentum and underlying trend of a security`s price.