Rolling mills are industrial machines used to shape and reduce the thickness of metal materials. They work by passing metal through a series of rollers, which compress and elongate the material. This process is essential in producing various metal products, such as sheets, plates, and bars, used in construction and manufacturing. There are different types of rolling mills, including hot rolling mills and cold rolling mills. Hot rolling involves shaping metal at high temperatures, while cold rolling is done at room temperature for better surface finish and tighter tolerances. Both types play a crucial role in the metalworking industry.