Hi Jann! Let me see if I can further demystify the difference. As Coyo said above, “relative” treats the dimension of the object as a single unit. I’ll use an irregular object as an example, as a cube is the same in each dimension (X, Y and Z).

If we change the Offset to “constant” then we’re telling Blender to offset the object by a distance factor. In this case, the units are set to Meters, so the Distance X is 1m. See how Suzanne – which has a dimension larger than 1 meter in the X direction – overlaps? The Object’s origin is what is offset in this case.

This applies to factors in Y and Z dimensions as well. It also applies to scale and rotation.