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The tank on the back of a toilet is typically referred to as the “toilet tank.” It’s a crucial component of the toilet that holds the water used for flushing. The worldwide process for how a toilet tank works is quite consistent:

1. Water Supply: The tank is connected to a water supply line that provides fresh water to refill the tank after each flush.
2. Flush Mechanism: Inside the tank, there is a flush mechanism that includes a flush valve (also known as a flapper) and a fill valve. When you press the flush handle or button, it lifts the flush valve, allowing water to rush from the tank into the bowl, creating a siphon effect that removes waste from the bowl and refills it with clean water.
3. Refill: Once the toilet is flushed, the fill valve opens to let in fresh water to refill the tank. This is important because the tank needs to be filled and ready for the next flush.
4. Water Level Adjustment: The toilet tank typically has a float that controls the water level. When the tank is full, the float rests on top of the water and shuts off the fill valve, preventing overfilling.
5. Flapper Closes: After the flush, the flush valve (flapper) falls back into place, sealing the tank. This keeps water in the tank until the next flush.

This process is quite standard across toilets worldwide, although there may be some variations in the design of flush mechanisms and water-saving features, such as dual-flush toilets that allow users to choose between a full flush and a partial flush for liquid waste.