Solids :

General name for MD-Solids and CAD-Solids.

MD-Solids :

Those Solids that we extrude from a sketch-loop in a Part when you do Add Profile or Add Auto-Profile.

Sketch-Loop :

A series of sketch-elements, that you join end to end to form a closed loop. See examples: sketch-loop.

Profile :

When you do Add Profile, we add two offset contours as copies of the sketch-loop you select. The Profile contours are offset by different distances from the Mechanism-Plane.

Auto-profile :

A Profile that we add to a quasi sketch-loop (that we also add) when you do Add Auto-Profile.

Quasi Sketch-Loop :

A sketch-loop with limited options, to which we add Auto-Profiles, that we add to a Part when you do Add Auto-Profile.

extrusion :

The Solid between the two offset contours of the Profile.

CAD-Solids :

Those Solid models that you import from CAD onto a CAD-Line - see CAD-Line dialog.