Plumbers are skilled tradespeople who specialize in installing and repairing systems that transport water, gas, and waste in residential and commercial buildings. They work with various materials, including pipes, fixtures, and fittings, to ensure that plumbing systems function properly and efficiently. Their tasks often include fixing leaks, unclogging drains, and installing appliances like sinks and toilets. Plumbers must understand local building codes and safety regulations to ensure their work meets legal standards. They may also work with related professionals, such as contractors and electricians, to complete larger construction projects.