AC Adapter

The AC adapter, AC/DC adapter or AC/DC converter is a type of power supply - typically those that are embedded in an over-sized AC plug. Other names include plug pack, plug-in adapter, adapter block, domestic mains adapter, or power adapter. Informal terms include wall wart, wall cube and power brick. These are typically packaged with electrical devices that do not contain their own power supply.

By separating the power supply from the main body of the electronic device, it can be made more compact and lighter. Any heat dissipated by the power supply is outside the device, so it can run cooler. Using standardized commodity external power supplies can simplify regulatory approval for sale in various countries; only the power supply itself needs to be tested for national standards compliance, instead of a whole device.