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Telephones are devices that are used to transmit and receive spoken communication over a distance. They consist of a microphone, which is used to capture the user's voice, and a speaker, which is used to play back the voice of the person on the other end of the call. Most modern telephones also have a keypad or dial-pad for making calls, and a display screen that shows the phone's status and other information. Telephones can be connected to a phone line or a cellular network and may be used with a handset, a headset, or a speakerphone. There are many different types of telephones, including landline phones, mobile phones, and VoIP phones. Telephones have been around for over a century and continue to be a widely used means of communication today.