Source : Free On-Line Dictionary of Computing

video compression
     
        {Compression} of sequences of images.  Video compression
        {algorithm}s use the fact that there are usually only small
        changes from one "frame" to the next so they only need to
        encode the starting frame and a sequence of differences
        between frames.  This is known as "inter-frame coding" or "3D
        coding".
     
        {MPEG} is a committee producing {standard}s in this area and
        also the name of their standard {algorithm}.  {H.261} is
        another standard.
     
        See also {Integrated Information Technology}, {3DO},
        {full-motion video}, {Online Media}.