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Cable modems are electronic devices that facilitate high-speed internet access through cable television lines. They serve as a bridge between a user's computer or network and the internet service provider (ISP), enabling bi-directional data communication over cable TV networks. Cable modems can be considered a type of computer accessory, as they are not standalone computers but rather peripherals that enhance the functionality of a computer system. These devices typically come in the form of a small box with multiple ports, including an Ethernet port for connecting to a user's network and a cable TV coaxial input for connecting to the ISP's network. Some cable modems also have built-in wireless access points, allowing users to connect their devices wirelessly. Cable modems are designed to be compatible with specific types of cable networks, such as those used by major ISPs like Comcast, Time Warner Cable, and Cox Communications. They use industry-standard protocols, such as Data Over Cable Service Interface Specification (DOCSIS), to communicate with the ISP's network and provide high-speed internet access to users. Overall, cable modems are an essential component of modern home and business networks, providing fast and reliable internet connectivity for a wide range of devices and applications.