The answer to 'how does faucet work' is that a faucet is a fixture that controls the flow of water in a sink, shower, or bathtub. It typically consists of a valve that opens and closes to allow water to flow, as well as a spout that directs the water. The valve is operated by a handle or knob that turns to open and close the faucet.
When the faucet is turned on, the valve opens, allowing water to flow through the pipes and out of the spout. The amount of water flow is controlled by how far the handle or knob is turned. Faucets can have one or more valves, depending on whether they are single-handle or two-handle models. The internal components, such as washers, springs, and seals, help to ensure a smooth and drip-free operation.