Telephone
A telephone, also known as a phone, is a communication tool. People use it to talk with people far away. Originally, it was an electric tool sending analogue speech through wires. Many telephones in the 21st century are electronic tools sending digital signals on wires or radio transmission. Using a telephone, two people who are in different places can talk to each other. Early telephones needed to be connected with wires which are called fixed or landline telephones. Modern mobile phones use radio waves.