Solid modeling refers to
modeling of parts that occupy a volume in 3D space, which is a requirement for volumetric
analysis, 3D printing and machining. Surface modeling is an intricate modeling
of smooth surfaces to eventually form a solid. CAD Assembly is placing and
constraining various parts in an assembly with relationship to each other. CAD
Drafting is making of a digital drawing. Patent illustration refers to an image
of a patent idea with its construction and working.