The PCMCIA Fax Modem 56K WDM Modem Enumerator is a Windows driver that allows your PC to interact with a PCMCIA (Personal Computer Memory Card International Association) fax modem, typically used for dial-up internet connections or sending/receiving faxes. The 56K indicates that the modem supports speeds up to 56 Kbps, which was standard for dial-up connections. The WDM (Windows Driver Model) indicates that it is a modern driver that is compatible with newer versions of Windows and provides more efficient communication between the modem hardware and the operating system.