What is the function of a flapper flush valve in a toilet system and how does it contribute to the overall efficiency of the flushing mechanism?

The flapper flush valve in a toilet system controls the release of water from the tank into the bowl during flushing. It opens when the flush handle is pressed, allowing water to flow into the bowl and then closes to stop the flow once the desired amount of water has been released. This mechanism helps regulate the amount of water used for each flush, contributing to the overall efficiency of the flushing process by ensuring that only the necessary amount of water is used to effectively clear the bowl.