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[[File:Wheel Machining.jpg|thumb|CNC machines typically use some kind of coolant, typically a water-miscible oil, to keep the tool and parts from getting hot.]]
[[File:Cnc lathe.png|thumb|A CNC [[metal lathe]] with the door open.]]
'''Computer numerical control''' ('''CNC''') or '''CNC machining''' is the [[Automation|automated control]] of [[machine tool]]s by a computer. It is an evolution of '''numerical control''' ('''NC'''), where machine tools are directly managed by [[data storage media]] such as [[punched card]]s or [[punched tape]]. Because CNC allows for easier programming, modification, and real-time adjustments, it has gradually replaced NC as computing costs declined.
A CNC machine is a motorized maneuverable tool and often a motorized maneuverable platform, which are both controlled by a computer, according to specific input instructions. Instructions are delivered to a CNC machine in the form of a sequential program of machine control instructions such as [[G-code]] and M-code, and then executed. The program can be written by a person or, far more often, generated by graphical [[computer-aided design]] (CAD) or [[computer-aided manufacturing]] (CAM) software. In the case of 3D printers, the part to be printed is "sliced" before the instructions (or the program) are generated. 3D printers also use G-Code.<ref name=":1">{{Cite web |date=2022-06-24 |title=What is CNC Milling and How Does it Work: Everything You Need to Know |url=https://www.3erp.com/blog/cnc-milling-everything-you-need-to-know/ |access-date=2025-03-18 |website=3ERP}}</ref>
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