The USB Device of Smart Link Soft Modem is typically a software modem (or "soft modem") driver for a device that connects to the internet or provides dial-up functionality via USB. The "Smart Link" part of the name refers to a specific chipset or technology used by the modem. Soft modems rely on the computer's processor for certain functions (like signal processing), unlike traditional hardware modems that have their own dedicated chips. These modems are often used for dial-up connections, although they are less common today due to broadband internet.