CNC machining refers to a manufacturing process where computer numerical control (CNC) software directs the movement of factory tools and machinery, allowing for precise cutting and shaping of materials like metal or plastic by following pre-programmed instructions to create complex parts with high accuracy; essentially, it's a computerized method of controlling machine tools like mills, lathes, and grinders to precisely remove material from a workpiece based on a digital design. It is widely used to create parts for various industries including automotive, aerospace, medical, and electronics.