Developed by Gerald Appel, the Moving Average Convergence/Divergence(MACD) is a momentum indicator used to show the relationship between a 26-day and 12-day Exponential Moving Average with a 9-day Exponential Moving Average (the "signal" or "trigger") line plotted on top to show buy/sell opportunities.

The difference between MACD and MACD Dema(MACDDema) is that MACDDema uses the DEMA indicator instead of the EMA indicator in the calculation of moving averages. The advantage is that DEMA gives a reduced amount of lag time than EMA. Thus MACDDema usually produces signals earlier than MACD.