A piece of equipment, commonly powered by electricity, used to perform a particular energy-driven function.

Examples of common appliances include refrigerators, clothes washers and dishwashers, conventional ranges/ovens and microwave ovens, humidifiers and dehumidifiers, toasters, radios, and televisions.

Appliances are ordinarily self-contained with respect to their functions; however, equipment such as central heating and air conditioning systems and water heaters, which are connected to distribution systems inherent to their purposes, are not considered appliances.