CAD stands for Computer Aided Design and describes the computer-aided creation of 2D drawings and 3D objects. In CAD programs are generally the first step from the idea to the finished product. The results of CAD are e.g. sketches, drawings or 3D models which are then often used as a basis for CAM. CAM stands for Computer Aided Machining. This means e.g. the creation of paths for CNC routing. CAM programs determine how objects are routed out, which routing strategies are used and which router cutters are used. Here it is often decided between 2.5D and 3D. 2.5D is meant when two-dimensional contours are machined at different depths. It is called 3D when inclined or curved surfaces are also machined.