XY gantries provide two-directional movement, which means they move horizontally (along the X-axis) and vertically (along the Y-axis).  XY gantries are widely used in applications that require precise two-dimensional movements, such as pick-and-place, material handling, and inspection applications.
XYZ gantries operate along three axes; X, Y, and Z.  Like XY gantries, they can move horizontally (along the X and Y axes) and vertically (along the Z-axis).  XYZ gantries are utilised in applications where three-dimensional movement and positioning are required.  For example, in 3D printing, CNC machining, and automated assembly lines, an XYZ gantry allows for precise control of the tool or nozzle in three-dimensional space.