An 802.11 b/g USB Adapter is a wireless network adapter that allows a computer to connect to Wi-Fi networks using the 802.11 b/g wireless standards. These standards are part of the IEEE Wi-Fi family and specify how devices communicate over wireless local area networks (WLAN). Specifically:
The USB adapter is a small device that plugs into your computer's USB port, enabling Wi-Fi connectivity. It is typically used for devices without built-in wireless support or to upgrade the Wi-Fi capabilities of older computers.
The driver for the adapter is software that allows your computer's operating system (such as Windows) to communicate with the adapter and manage network connections.