Coaxial cables or coax is a type of cable used for carrying electrical signals, typically for television and internet connections. They have a single conductor surrounded by layers of insulation, shielding, and a protective outer jacket. The inner conductor is typically composed of copper and the shielding is composed of braided copper or foil. Coaxial cables deliver reliable and high-performance signal transmissions and are used for a variety of applications such as radio, television, and computer networking. Coaxial cables are often much thicker than other cables because of the extra layers of shielding and insulation which helps to reduce interference on the transmissions they're carrying.