Tutorial 3: Defining 3D

What are the basic things 3D is made of?

Short summary:

Vertice: point in 3D-space, defined by its position on the X, Y and Z axis.

Edge: line in 3D-space between 2 vertices.

Face or poly(gon): face created by 3 or more edges.

These 3 things are all that defines a 3D-object.