Enameled winding wire, also known as electric winding wire or magnet wire, is a copper or aluminum conductor coated with a thin, tough, continuous polymer film layer of insulation. This insulation makes the wire suitable for electrical applications that require compactness, efficiency, and durability. It serves as a principal component in electrical motors, transformers, switchgear, consumer and industrial electronics, automotive electrical systems, refrigerators, air conditioners, domestic appliances, pumps, and fans.