Source : Free On-Line Dictionary of Computing

Berkeley Software Distribution
     
         (BSD) A family of {Unix} versions for the
        {DEC} {VAX} and {PDP-11}, developed by {Bill Joy} and others
        at the {University of California at Berkeley}.  BSD Unix
        incorporates {paged} {virtual memory}, {TCP/IP} networking
        enhancements, and many other features.
     
        BSD UNIX 4.0 was released on 19 October 1980.  The BSD
        versions (4.1, 4.2, and 4.3) and the commercial versions
        derived from them ({SunOS}, {ULTRIX}, {Mt. Xinu}, {Dynix})
        held the technical lead in the Unix world until {AT&T}'s
        successful standardisation efforts after about 1986, and are
        still widely popular.
     
        See also {Berzerkeley}, {USG Unix}.
     
        (1994-11-23)