Charts enable your company to display in compelling graphical format the contents of its Excel worksheets. Whether you've created a chart without a legend or deleted a legend from an existing chart, ...

An Excel chart's legend identifies its data series markers. For example, if a chart compares several products' sales, colored lines track each product. The legend contains colored lines as well, and ...

So, select any cell in your formatted Excel table, and in the Insert Tab on the ribbon, click the top half of the split "PivotChart" button.