Digital modeling and fabrication is a process that joins design with production through the use of 3D modeling software or computer-aided design (CAD) and additive and subtractive manufacturing processes. 3D printing falls under additive, while machining falls under subtractive. These tools allow designers to produce material digitally, which is something greater than an image on screen, and actually tests the accuracy of the software and computer lines.
Digital fabrication is the process used in a Fab Lab (Fabrication Laboratory) to create things.