Source : Free On-Line Dictionary of Computing

video conferencing
     
         A discussion between two or more groups of
        people who are in different places but can see and hear each
        other using electronic communications.  Pictures and sound are
        carried by the telecommunication network and such conferences
        can take place across the world.
     
        To overcome the {bandwidth} and {latency} limitations of
        current networks (especially the {PSTN}), some form of {video
        compression} is often used.
     
        (1995-05-01)