Define category labels in Microsoft Excel?

It labels items on a chart. Category labels go across the bottom, on the horizontal or X-Axis. Values are normally on the Y-Axis. So if it were a bar chart, a category would have a bar coming from the X Axis and its value would be measured by what point on the Y-Axis it is equal to. The category labels tell us what that bar represents, like sales or profits or a particular year etc.