what is the difference between subdivision surface and Nurbs?

[wowpilot]

I wonder which technis is used in catia GSD? and which one is easy? What is the cons and pros of 2 approach to design world?

 

[MrCATIA]

I had to look this one up, so here's my quick summary:

Both are used to define curves and surfaces. I know that CATIA V5 uses NURBS for GSD geometry, but I'm not sure if other workbenches use Subdivision surfaces. "Subdivison" is a method of approximating a curve or surface. NURBS is a type of equation used to define a curve or surface.