What are the different internal toilet parts and how do they function together to ensure proper flushing and water flow in a toilet system?

The main internal parts of a toilet are the flush valve, fill valve, flapper, and overflow tube. The fill valve controls the water level in the tank, while the flush valve releases water into the bowl when the handle is pressed. The flapper seals the tank to prevent water from leaking, and the overflow tube prevents the tank from overflowing. Together, these parts work to ensure proper flushing and water flow in a toilet system.