What is the primary function of a cable modem?

The primary function of a cable modem is to connect a home or office network to the Internet through a cable television system. It modulates and demodulates signals, allowing digital data from the Internet to be transmitted over the same cables used for cable television. This makes it a crucial piece of hardware for facilitating high-speed Internet access, enabling users to browse, stream, and download content efficiently.

While other devices may perform different functions, such as providing telephone service or managing local networks, they do not fulfill the main role of enabling Internet connectivity through cable lines. Therefore, the connection of a user's network to the Internet is inherent to what a cable modem does, distinguishing it from other equipment.