Gravity-flush toilets are a common type of toilet that use the force of gravity to move waste from the bowl to the sewer system. When the toilet is flushed, water from the tank flows into the bowl, creating a siphoning effect that pulls waste away. This design is simple and effective, requiring minimal maintenance. These toilets typically have a tank located above the bowl, which allows gravity to assist in the flushing process. They are often more water-efficient than older models, making them a popular choice for both residential and commercial use. Many modern gravity-flush toilets also feature improved designs for better performance and reduced water usage.