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Computer Aided Design (CAD) is the use of computer software to create, modify, analyze, and optimize 2D drawings and 3D models of physical objects. CAD allows engineers and designers to visualize products, perform simulations, create detailed documentation before manufacturing, and to fabricate models using additive or substractive manufacturing methods.
There are many CAD softwares that engineers may choose to use:
Fushion360 from Autodesk:
Blender: