A line telephone, also known as a landline or POTS (Plain Old Telephone Service), is a type of phone that uses a wired connection to transmit audio signals. This means that instead of relying on wireless technology like cell phones do, line telephones are connected directly to the telephone network through a physical wire. Line telephones typically provide clearer and more reliable sound quality than their cordless counterparts, but they also require a dedicated phone jack and cannot be moved around freely.