Plumbing refers to the system of pipes, fixtures, and fittings that are used to convey water, gas, stormwater and waste in buildings. This system is responsible for supplying clean water for consumption, removing stormwater, waste and sewage, and providing gas for heating and cooking. Plumbing also includes the installation and maintenance of fixtures such as sinks, toilets, showers, and water heaters. A licensed plumber is trained to install, repair, and maintain plumbing systems to ensure their proper operation and safety.