The TP-LINK TL-WN821N 11N Wireless Adapter is a USB Wi-Fi adapter that allows your computer to connect to a wireless network. It supports 802.11n wireless standards, which provides a faster and more stable Wi-Fi connection compared to older standards like 802.11b/g. The device typically works by plugging into a USB port on your computer and allowing it to access a wireless router or access point.

The driver for the TP-LINK TL-WN821N wireless adapter is necessary for Windows to communicate with the device and enable its wireless functionality. Without the proper driver, the adapter may not work correctly, or Windows may not even recognize it.