Namespace

A namespace is a collection of uniquely named objects. Examples of hierarchically structured namespaces are the file system and the Active Directory.

Organizational Units

Users organize numerous files by using folders.

Administrators organize the numerous AD objects with OU Organizational Units.

OUs should be used to group objects that have a common administration group. For example if an administrator is responsible for a group of users, then those users should be in a common OU.

Domains

A domain is a collection of servers, computers, users and other objects. A domain is a partition of the AD where the domain objects are stored together on specific domain controllers. Domains are organized into a

• tree structure, or a
• group of tree structures called a forest.