Telephone lines are physical connections that transmit voice and data signals between telephones and communication networks. They typically consist of copper or fiber-optic cables that carry electrical or light signals over long distances. These lines enable people to communicate with each other, whether locally or internationally, by connecting to a central exchange or switching system. In addition to traditional landline telephones, telephone lines also support various services, including internet access and television broadcasting. The development of digital technology has improved the efficiency and speed of these lines, allowing for clearer calls and faster data transmission.