Yes what tiler says, a normal is a vector with a length of 1. Basically it is a "line" or direction that tells which way a surface or vertex(a dot objects are made of) is facing. So if a normal's coordinates are x=0, y=1, z=0, then the polygon is facing up. Normals are useful for a lot of stuff, i.e lighting, collisions, etc.
What is a 'normal'?
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