What is 3D?

Three-dimensional space (also: 3D space) is a geometric setting in which three values (called parameters) are required to determine the position of an element (i.e., point). This is the informal meaning of the term dimension.

We can also understand, 3D design is the process of using computer-modeling software to create an object within a three-dimensional space. With the help of pictures we can see the differences well.