You have created a diagram which represents the sales of your company for the last 6 months, for example. If you now want to see how sales have relatively developed or you want to make a prediction as to how revenue will look in the coming months, then the trend lines in Excel 2010 will help you further along. Based on the previous data in the chart, they make a trend or a forecast in the form of a line. In this video you will learn about various forms of the trend line and how to apply them.