Computer-Aided Design(CAD) is the use of computer technology to design and engineer complex parts and mechnisms for use in products. CAD involves the use of modeling software that can develop 2D and/or 3D models or drawings of physical components. CAD can also be used to create assemblies of products that have many moving parts.
CAD is used to develop photo-realistic renderings by applying life-like material textures and colors to the various parts of the model. CAD models can be used to build prototypes of products. Once all of the details are designed and optimized, the optimized CAD is used to make the final manufactured product.
Be cautious. Many people know how to create CAD models, but only product development experts know how to create CAD models that can be readily used to manufacture or prototype new inventions.