Coaxial lines are communication cables that transmit electrical signals with minimal loss of signal strength. They have two conductors, an inner conductor, and an outer conductor surrounding it, separated by an insulating material. These cables are used for a wide variety of applications, including cable TV, internet, and phone networks. Synonyms for coaxial lines include coaxial cable, coax, and RF cable. Coaxial cables are also commonly known as broadband cables or cable internet, which describes their use in delivering high-speed internet service to homes and businesses. No matter what you call it, coaxial cable is an essential component of modern communication networks.