The Sierra Wireless Mobile Broadband Network Adapter is a driver software package that enables your computer to connect to mobile broadband networks using a Sierra Wireless cellular modem or a mobile hotspot device. These adapters are typically used to provide 3G or 4G LTE connectivity through a cellular network, offering an internet connection on the go.

The driver acts as a bridge between the operating system (Windows, in this case) and the Sierra Wireless device, allowing the device to function properly, establish a connection to the mobile network, and transfer data.