Plumbing refers to the system of pipes, fixtures, and fittings installed in a building to distribute water for drinking, washing, heating, and sanitation purposes, as well as to remove wastewater. Plumbing systems typically consist of supply lines that bring clean water into the building and drainage lines that carry away used water and waste. Common plumbing fixtures include sinks, toilets, showers, bathtubs, faucets, and water heaters. Plumbing systems can be complex and require proper design, installation, and maintenance to ensure functionality, efficiency, and safety. Qualified plumbers are typically responsible for installing, repairing, and maintaining plumbing systems in residential, commercial, and industrial buildings.