The Xircom MPCI Modem 56 is a 56K dial-up modem designed for use with laptops, particularly those that use the MPCI (Mini PCI) slot. Xircom was a well-known manufacturer of network adapters and modems before it was acquired by Intel in 2001. The 56 refers to the modem's maximum download speed of 56 kbps (kilobits per second), which was standard for dial-up modems in the late 1990s and early 2000s.

The Xircom MPCI Modem 56 Windows driver allows your computer (typically running a version of Windows like Windows XP, 2000, or older) to communicate with the Xircom modem. This driver ensures that the operating system can correctly recognize the hardware, use its functions, and provide access to the modem's dial-up features.