Updated: 11/16/2019 by Computer Hope
Diagram of X-axis, Y-axis, and Z-axis.

With a three-dimensional plane, the z-axis refers to the depth of a three-dimensional object. In the illustration, the z-axis plane goes front to back and intersects with the y-axis and x-axis at the origin.

3-D, Absolute coordinates, Axis, X-axis, Y-axis