Source : Free On-Line Dictionary of Computing

webcasting
     
         (From "World-Wide Web" and
        "broadcast", sometimes just called "push") {Multicasting} on
        the {Internet}.  Webcasting implies {real-time} {streaming}
        transmission of encoded {video} (or {audio}) under the control
        of the {server} to multiple recipients who all receive the
        same content at the same time.  This is in contrast to normal
        web browsing which is controlled from the {browser} by
        individual users and may take arbitrarily long to deliver a
        complete document.
     
        {Pointcast} and {Marimba} were early pioneers.
     
        {International Webcasting Association
        (http://www.webcasters.org/)}.
     
        (2003-07-08)