CAD and CAM are complementary, they are generally used together, design with CAD, and then manufacture with CAM. Most importantly, from the perspective of the working environment, CAD and CAM have a lot in common. They all work with two-dimensional (2D) or three-dimensional (3D) graphics (drawings), and both CAD and CAM improves design and processing efficiency. The most important points are CAD and CAM can be operated paperless, and data can be transmitted through U disk or data cable.