The Cinterion USB Modem Windows driver is a software package that allows your Windows computer to communicate with and use a Cinterion USB modem for cellular data connections. Cinterion is a brand of wireless communication devices, including USB modems, used for Internet connectivity, typically via cellular networks like 3G, 4G, or LTE.

Installing the correct driver ensures your computer can recognize the modem when it's connected via USB and allow you to access mobile data through the device. Without the correct driver, the modem may not function properly, and the operating system may not be able to establish a stable connection.