CNC stands for “computer numerical control”. “Router” in this context refers not to internet modems but rather a power tool with a flat base and a rotating blade. A CNC router is a computer-controlled cutting machine. CNC routers can cut materials such as wood, aluminum, steel, composites, foam, plastic, and glass. Using a computer-controlled model, CNC routers can cut precisely to the millimeter and can easily reproduce copy after identical copy.