When referring to the cartesian plane, the x-axis or horizontal axis refers to the horizontal width of a two or three-dimensional object. The illustration shows the x-axis as going left-to-right and intersecting both the y-axis and z-axis.
Below are a few other examples of how the x-axis is used on a computer.
- A character or another object in a computer game, which moves left and right on the screen has an x-axis value that determines its location on the screen.
- In computer graphics, if you wanted to draw a horizontal line the x-axis can be used to determine the start and end point of the line. Drawing a two-dimensional object would require only the x-axis and y-axis. However, a 3D object would require a z-axis.
- In addition to the mouse, other input devices like a joystick also use an x-axis to control objects such as a tank or airplane.