With the exception of pie graphs, all graphs have a value axis which displays the unit of measurement for the graph. You can choose to display the value axis on one side or both sides of the graph. Bar, stacked bar, column, stacked column, line, and area graphs also have a category axis which defines the categories of data in the graph.
You can control how many tick marks appear on each axis, change the length of tick marks, and add a prefix and suffix to numbers on the axis.