The "x-axis" usually refers to the horizontal axis. In Excel, that would be relevant for graphs created with Excel.
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Category axis.
the horizontal axis for chart is called X-axis.
It is the horizontal line at the bottom of the chart.
All you do is select it and press "B" for Bold
The Y axis is the vertical access, in other words the one that goes up and down. The X access is horizontal and so it goes across a chart. The Y axis is sometimes known as the value axis.