The Motorola SM56 WDM Device driver is used for the Motorola SM56 Data/Fax Modem, which was a popular modem used in older desktop and laptop computers. The "WDM" (Windows Driver Model) signifies that the driver is designed to work with the Windows operating system, providing support for both data and fax functionalities, typically for dial-up internet connections or faxing.

The SM56 WDM driver helps Windows interface with the modem, allowing it to establish dial-up internet connections or send/receive faxes. While dial-up modems are largely obsolete today, this driver might still be needed for legacy systems or for specific use cases, such as in remote areas where broadband isn't available.