Directory Services encapsulate and expose objects within a network,
offering a unified way of accessing different types of data. Of
particular interest on the Windows platform is the Active Directory,
which supplies powerful and flexible methods for managing users,
servers, and resources in a single information store that is globally
accessible throughout an enterprise. Knowing how and when to use a
Directory Service effectively will enable you to develop applications
that store infrastructure information safely, as well as perform
management or administrative tasks.