A gravity dam is a type of dam that relies on its own weight to resist the force of water pushing against it. Typically made from concrete or masonry, these dams are designed to be thick at the base and taper towards the top, allowing them to effectively hold back large volumes of water in reservoirs. The design of a gravity dam ensures stability by using the gravitational force of the materials to counteract the water pressure. Commonly found in areas with significant water flow, gravity dams are essential for water supply, flood control, and hydroelectric power generation, contributing to the management of water resources.