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An Organizational unit is a particularly useful type of directory object contained within domains is the organizational unit. Organizational units are Active Directory containers into which a Network Administrator can place users, groups, computers, and other organizational units. An organizational unit cannot contain objects from other domains.

An organizational unit is the smallest scope or unit to which an Adiministrator can assign Group Policy settings or delegate administrative authority. Using organizational units, an Administrator can create containers within a domain that represent the hierarchical, logical structures within your organization. An Administrotr can then manage the configuration and use of accounts and resources based on your organizational model.