A telephone circuit is a dedicated line or channel that carries voice and/or data signals from one point to another. When speaking of telephone circuits, the following synonyms may be applicable: phone line, phone network, communication line, communication channel, telephone cable, telephone wire, wiring for telephony, telephone network, phone system, telecommunication channel, or simply circuit. A circuit can be analog or digital and may be transmitted over copper wires, fiber-optic cables, or radio waves. Regardless of the name or method, the function of these circuits remains the same - to provide a reliable and secure connection for communication purposes.