A milling machine is a versatile tool used in manufacturing to shape and cut materials, primarily metals. It operates by rotating a cutting tool against the workpiece, allowing for precise removal of material. This process can create various shapes, including flat surfaces, grooves, and complex contours. Milling machines come in different types, such as vertical and horizontal, depending on the orientation of the spindle. They are commonly used in industries like automotive and aerospace for producing parts and components. The ability to automate milling processes has also led to increased efficiency and accuracy in production.