Node Description and Purpose
This node takes the vector from the Input and normalizes it. This means it converts it to a unit vector, which is a vector that has a length equal to 1.
Normalized or unit vectors are useful for all sorts of reasons. A prime example is when you want to find the angle between two vectors using the Dot product.
Node Type: Function
This node doesn't have any settings apart from the Input.
A vector is a set of three scalars, normally representing X, Y and Z coordinates. It also commonly represents rotation, where the values are pitch, heading and bank.