A water wheel is a device that converts the energy of flowing or falling water into mechanical energy. It typically consists of a large wheel with blades or buckets attached to its circumference. As water flows over or under the wheel, it causes the wheel to turn, which can then be used to power machinery or generate electricity. Water wheels have been used for centuries in various applications, including milling grain and sawing wood. They are often associated with historical sites and can be found in many regions around the world, showcasing the ingenuity of early engineering and the importance of hydropower in sustainable energy practices.