Nurbs stands for Non-Uniform Rational B-Spline which sounds like a complicated name for a complicated subject. In Blender Nurbs are Editable Curves such as you have experienced when using Bezier type curves. Nurbs curves are claimed to be more precise than Bezier curves but to understand and prove the claim you would have to undertake an advanced course in mathematics. In this discussion you will be shown the practical application of Nurbs Curves in demonstrations.
Metashapes or to be precise Meta objects are implicit surfaces, meaning that they are not explicitly defined by vertices (as meshes are) or control ...