• Features—Individual geometry created one at a time. Features include datums, extrusions, holes, rounds, chamfers, surface features, cuts, patterns, sweeps, and so on. You can have multiple features in a part.

• Parts—Collection of geometric features that define the geometric entity called the part. Parts are referred to as components in an assembly. You can have multiple components in an assembly.

• Assemblies—Collection of components assembled together to create the model. You can have multiple assemblies and subassemblies in a hierarchical order according to their relationships with other assemblies and the master assembly.