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 takes into account factors such as the water pressure and the geological conditions of the site. By using the force of gravity, these structures can maintain stability and prevent failure, making them a common choice for water management in various regions.