Question 1

What is CAD software?

Accepted Answer

CAD (computer-aided design) software is used to create precise 2D drawings and 3D models of physical objects, mechanical parts, buildings, and systems. It replaces manual drafting with digital tools that support measurement, simulation, and direct manufacturing output.

Question 2

What is the most common CAD file format?

Accepted Answer

DWG is the most widely used 2D CAD format, originally created by AutoDesk for AutoCAD. For 3D data exchange between different programs, STEP (.step) and IGES (.igs) are the most common neutral formats, while STL is standard for 3D printing meshes.

Question 3

Is there free CAD software?

Accepted Answer

Yes. Free options include Autodesk's Fusion 360 for personal use, Onshape's free tier, SketchUp Free, and open-source tools like FreeCAD. Capabilities vary: some are hobbyist-oriented while others offer nearly full professional feature sets with usage limits.