A USB ADSL2 WAN Adapter is a device that allows a computer to connect to an ADSL (Asymmetric Digital Subscriber Line) broadband network using a USB port. It typically serves as an interface between the computer and an ADSL service provided by an Internet Service Provider (ISP). The "ADSL2" refers to a faster version of the ADSL standard, capable of providing higher speeds and better performance.

The Windows driver for a USB ADSL2 WAN Adapter is a piece of software that enables your computer to communicate with the adapter and use it to connect to the internet. The driver ensures that your computer recognizes the adapter, provides necessary functions (such as data transmission), and enables you to configure your ADSL connection properly.