A cable modem is a device that connects a computer or network to the internet using a cable television line. It converts digital data from the internet into a format that can be transmitted over coaxial cables, which are typically used for cable TV. This allows users to access high-speed internet services provided by cable companies. Cable modems work by communicating with a cable service provider's network. They often include built-in routers to allow multiple devices to connect wirelessly. This technology enables faster internet speeds compared to traditional dial-up connections, making it a popular choice for homes and businesses.