A legend in Microsoft Excel could be best described as the one which is linked to the data that is being graphically displayed in a chart, using the data in the spreadsheet. And each individual element in a Legend is defined as the Legend Key. If you are interested in learning more about Microsoft Excel and wish to get trained and certified, then check out the Advanced Excel courses from Intellipaat. Also, watch the following video on Excel Course and get started, by learning it from industry-experts.