Why When you turn on a faucet water pours out of the tap into a basin and then down the drain?

When you turn on a faucet, a valve opens, allowing pressurized water from the Plumbing system to flow through the tap. Gravity causes the water to pour out into the basin below. The basin collects the water, and once it reaches a certain level, it flows down the drain due to gravity, leading it away from the sink. This process is driven by the combination of water pressure and gravity.