The Smart Link 56K Modem Voice Device is a software driver for a 56K dial-up modem that enables your computer to connect to the internet via a phone line. This type of modem was commonly used in the late 1990s and early 2000s before broadband internet became widely available. The "Voice" aspect indicates that the modem also supports voice features, such as making and receiving phone calls over the same line used for internet access.