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A GPO is a series of settings that can be applied to a local computer, site, domain, or organizational unit (OU). Each GPO is identified by its Globally Unique Identifier (GUID), which is a 128-bit number assigned when the GPO is created. This identifier is unique to the forest and is stored as an attribute used to identify it within the Active Directory hierarchy.
The content of GPOs is stored in the following two containers: