A cable box is a device used to receive and decode television signals from a cable service provider. It connects to a television and allows viewers to access various channels, on-demand content, and additional features like digital video recording. The box typically requires a subscription to a cable service, which provides the programming. Most cable boxes come with a remote control for easy navigation. They may also include features such as HDMI output for high-definition viewing and Ethernet ports for internet connectivity. Some advanced models offer streaming services and apps, enhancing the overall viewing experience.