An adapter is an interface converter. It can be a stand-alone hardware interface device that allows hardware or electronic interfaces to be connected to other hardware or electronic interfaces. It can also be an information interface. For example: power adapters, tripod base transfer parts, USB and serial port switching equipment.
Power adapter is a small portable electronic equipment and electronic appliances power supply conversion equipment, generally composed of shell, power transformer and rectifier circuit, according to its output type can be divided into AC output type and DC output type, according to the connection mode can be divided into wall plug type and desktop type. The power adapter is especially important for mobile PC because there is no battery.