MACD analysis uses three moving averages, often exponential. Two of them are based on the number of price periods used and the third an average of the difference between the two moving averages. The difference between the readings of the two moving averages is usually shown as a histogram, while the average of that difference is shown as a moving average line plotted on top of the histogram. An important part of MACD analysis is how its movements compare with price movements to determine strength or weakness in the market.