CNC machine tools, or Computer Numerical Control machines, are automated devices used in manufacturing to create precise parts and components. They operate by interpreting a computer program that dictates the movements of the machine, allowing for high accuracy and repeatability in cutting, drilling, and shaping materials like metal, wood, and plastic. These machines come in various types, including CNC lathes, CNC mills, and CNC routers, each designed for specific tasks. By using CNC technology, manufacturers can produce complex designs quickly and efficiently, reducing human error and increasing productivity in the production process.