#.Unit
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a unit vector is a vector that is "normalized" or, all the components of the vector (X, Y, and Z) are divided by the magnitude of the vector
the reason you'd want to do this is to represent a vector as a direction rather than a position on a coordinate plane
if you think of the center of the coordinate plane and the point (1, 0, 1) it's pointing forward and to the right
you'd use that for all kinds of stuff
you should look into a game dev math tutorial on vectors, it should help you understand the use cases