No, it could be a qualitative variable.
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It depends on the information being plotted. It is often the independent variable.
The horizontal axis usually represents the independent variable. One example is time. Time will change regardless of what problem you are analyzing with a graph. It could be seconds elapsed in a motion graph. Or it could be months, in a sales chart, for example. Distance could be another example of an independent variable. It just depends on what type of problem you are graphing.
the horizontal axis for chart is called X-axis.
It is the horizontal line at the bottom of the chart.
The Nolan chart's two axes represent personal and economic freedom.