Definition of "Y-axis" by Graphic Design Newcastle:
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The Y-axis is the vertical axis in a two-dimensional coordinate system. It is used to measure and represent values in the up-and-down direction. In most graphing contexts, such as charts, graphs, and design grids, the Y-axis typically shows dependent variables or quantities that change in response to values on the X-axis (the horizontal axis).
In graphic design and digital imaging software (like Adobe Illustrator or Photoshop), the Y-axis helps define object placement and alignment within a canvas or artboard, often with the origin (0,0) located at the top-left or bottom-left corner, depending on the software's coordinate system.