MACD stands for Moving Average Convergence / Divergence, a technical analysis indicator created by Gerald Appel in the late 1970s.[1] It is used to spot changes in the strength, direction, momentum, and duration of a trend in a stock's price.
The MACD is a computation of the difference between two exponential moving averages (EMAs) of closing prices. This difference is charted over time, alongside a moving average of the difference. The divergence between the two is shown as a histogram or bar graph.
Exponential moving averages highlight recent changes in a stock's price. By comparing EMAs of different periods, the MACD line illustrates changes in the trend of a stock. Then by comparing that difference to an average, an analyst can chart subtle shifts in the stock's trend.
Since the MACD is based on moving averages, it is inherently a lagging indicator. As a metric of price trends, the MACD is less useful for stocks that are not trending or are trading erratically.
Note that the term "MACD" is used both generally, to refer to the indicator as a whole, and specifically, to the MACD line itself.
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