Moving Average Convergence Divergence or commonly known as MACD is an effective and practical trend-following indicator which is widely available on most technical analysis software programs. http://forextradingseminar.com There are three types of trading signals generated by MACD: 1. MACD line crossing the signal line. 2. MACD line crossing 0. 3. Divergence between price and histogram, or between MACD line and price. MACD is the brainchild of professional investment adviser, author and lecturer, Gerald Appel.