What is a 3d vector?

Question

WebGL

What is the geometric meaning of a 3D vector? https://threejs.org/docs/index.html?q=Vector3#Refe...
Why is it set to three coordinates? What about length and direction?

Answer 1

just imagine that it comes from 0.0.0 hence we get the length, direction.
A vector can specify the movement of an object per unit of time.
Moving an object in space,
etc...

Answer 2

Quite simply, a vector is a collection of numbers as opposed to a single number (scalar). That's all you need to know about him. Nonsense about the length and direction, as well as the beginning and end of the vector, this is what children are taught in bad (all?) schools. Then it all depends on what value you attribute to it. Coordinates of a point in space, direction, movement, speed, color, etc. Accordingly, the length will only matter in some cases.