topology 3d

I need to understand more,What is topology means in 3D models? and how topology used in 3d models?

I just answered this question elsewhere, but my answer given:

3D topology is the way the lines flow in a 3D model. A good example to look at is a 3D head; a 3D head must have "good topology" if you're planning on animating it at a later stage, and good topology means the edges must run smoothly and flow so that it won't cause errors later, bad topology can cause many errors in the mesh when animating.