Cable is a type of flexible, insulated wire typically used for transmitting electrical signals. It is composed of multiple conductors, usually made of copper or aluminum, encased in a protective sheath. Cables come in various sizes and types, such as coaxial, fiber optic, and Ethernet cables, each designed for specific applications. They are commonly used in telecommunications, networking, and electrical systems to connect devices and transmit data or power. The durability and reliability of cables make them essential components in modern technology.