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The vertical line is known as the y axis. It is nothing more than a measuring stick to count how far up or down a point is from the horizontal line. The horizontal line, then, is known as the x axis and measures the distance left or right from the vertical line.
X-axis. 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. A good example of what uses the x-axis is a computer mouse. As the mouse moves left or right the x-axis value increases and decreases, which allows the computer to know where the mouse cursor is on the screen. Below is a JavaScript script, which if enabled shows you the mouses x-axis and y-axis position as you move your mouse on your screen.