A videophone is a telephone with a video screen, and is capable of full duplex (bi-directional) video and audio transmissions for communication between people in real-time.
At the dawn of the technology, videotelephony also included image phones which would exchange still images between units every few seconds over conventional POTS-type telephone lines, essentially the same as slow scan TV systems.
Currently videophones are particularly useful to the deaf and speech-impaired who can use them with sign language and with a video relay service, and also to those with mobility issues or those who are located in distant places and are in need of telemedical or tele-educational services.
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