Videotelephony also included "image phones" which would exchange still images between units every few seconds over conventional plain old telephone service (POTS) lines, essentially the same as slow-scan TV. It took until 1970 for AT&T to launch the first true videoconferencing system, wherein anyone could subscribe to the service and have the technology in their home or office. These early demonstrations were installed at "booths" in post offices and shown at various world expositions. While development of videoconferencing started in the late 19th century, the technology only became available to the public starting in the 1930s. Videoconferencing has also been called "visual collaboration" and is a type of groupware. Telepresence may refer either to a high-quality videotelephony system (where the goal is to create the illusion that remote participants are in the same room) or to meetup technology, which goes beyond video into robotics (such as moving around the room or physically manipulating objects).
Videoconferencing implies the use of this technology for a group or organizational meeting rather than for individuals, in a videoconference. A videophone is a telephone with a video display, capable of simultaneous video and audio for communication between people in real time.
Videotelephony, sometimes also referred to as video teleconference or videoconferencing, comprises the technologies for the reception and transmission of audio- video signals by users in different locations, for communication between people in real time.
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