A watermill is a mechanical structure that harnesses the kinetic energy generated by flowing water to perform mechanical work. These devices operate by directing water, typically through an overshot, undershot, or breastshot wheel, to convert the water's potential energy into rotational energy. The efficiency of the system depends on the volume, velocity, and gradient of the water source, as well as the mechanical design of the wheel and the gearing within the mill. Historically, such power sources were utilized for various industrial processes, including grinding grain, sawing timber, and powering early forms of textile production. The principle remains a fundamental example of mechanical energy conversion using hydraulics.