The ASUS 802.11b/g Wireless LAN Card is a network adapter that provides wireless connectivity to your computer, allowing it to connect to Wi-Fi networks. This card supports the IEEE 802.11b and IEEE 802.11g wireless standards, which are older Wi-Fi standards typically used for connecting to wireless networks at speeds of up to 54 Mbps. The driver for this card allows Windows to communicate with the hardware, enabling the wireless functionality.