Source : Free On-Line Dictionary of Computing

Active Directory
     
         A {directory service} from {Microsoft
        Corporation}, similar in concept to {Novell} {Netware
        Directory Services (NDS)}, that also integrates with the user
        organisation's {DNS} structure and is interoperable with
        {LDAP}.  Active Directory is included in {Windows 2000}.
     
        (2000-03-28)