On this graph we look that the stock AAPL, with a MACD trend indicator. This trend indicator oscillates between 2 speeds, the slow (blue line) and the fast (orange line). For this graph, I took for the slow curve the value of 12 and for the fast one a value of 26. This indicator show us the change on the trend every time the lines cross and our position will change depending on the MACD line crossing from below or from above. For example, if the MACD line crosses the average line up through the recommendation is to buy and the opposite is recommended if it crosses down through. Also note that the bars change in direction if the lines cross indicating a change of the direction of the trend.