Source : Free On-Line Dictionary of Computing

Direct Client to Client Protocol
     
         (DCC) An {IRC} {protocol} created to allow users
        to chat privately and to send and receive files directly
        instead of having to go thorugh the IRC servers.  DCC protects
        users from being monitored by IRC Server operators that have
        enabled conversation logging.  It also allows much more
        efficient use of available {bandwidth} as the data does not
        need to be {broadcast} all over the world just to reach a
        specific user.
     
        The available DCC commands include DCC CHAT (direct user to
        user chat), DCC SEND (direct user to user file send) and DCC
        GET (file acknowledgement from a receiver).
     
        (1995-04-12)