The LSI PCI Soft Modem is a type of modem that uses a PCI (Peripheral Component Interconnect) interface to connect to a computer's motherboard. It is typically used for dial-up internet connections, especially in older systems that do not have built-in modem functionality.

The "soft" in the name refers to the fact that the modem uses the computer's CPU and software to handle most of the modem's processing tasks, rather than using dedicated hardware. This is why it's called a "soft modem" or "WinModem" (Windows Modem), as it requires a driver and software for the system to operate properly.