Output from a computer is used to control CNC manufacturing machines such as millers or lathes...or even knitting machines. (CNC stands for Computer Numerical Control and means that instructions for the machines are given as numbers.)

CAD/CAM is the whole process of design and manufacture using computers. CAD is used to produce the design of a product and the code to run the CNC machine is output. The machine then manufactures the product.

Products may be designed on the computer and output is sent to 
a CNC () machine such as a lathe or a milling machine which makes it.