The boundary of a chart across the bottom and up the side can be the axis. It depends on the kind of charts. They are use to have the values or categories of data. In a column chart, the base of the column is at the X Axis for example.
The "x-axis" usually refers to the horizontal axis. In Excel, that would be relevant for graphs created with Excel.
the y axis in excel is also known as the value axis
The independent variable is on the horizontal axis.
Category axis.
The Y-Axis.
the horizontal axis for chart is called X-axis.
The vertical axis is the columns in a spreadsheet.
I tried creating a graph in Excel, but the x-axis always sets to the row number automatically. How do I change it?
Yes, but it is called "axis".
The horizantal lines
VALUE
Yes it does exist. And the question is ...