CNC milling is a computer-controlled machining process that uses rotating cutting tools to remove material from a solid block, creating precise shapes and features. The term "CNC" stands for Computer Numerical Control, which means that the machine operates based on programmed instructions, allowing for high accuracy and repeatability in manufacturing. This process is commonly used in various industries, including aerospace, automotive, and electronics, to produce parts and components. CNC milling can work with a variety of materials, such as metals, plastics, and wood, making it a versatile option for creating complex designs and prototypes.