Active Directory. Active Directory provides directory services for both the Windows network operating system (NOS) and for directory-enabled applications. For the NOS, Active Directory stores critical information about the network infrastructure, users and groups, network services, and so on. In this role, Active Directory must adhere to a single schema throughout an entire forest.
ADAM. ADAM provides directory services specifically for directory-enabled applications. ADAM does not require or rely on Active Directory domains or forests. However, in environments where Active Directory exists, ADAM can use Active Directory for the authentication of Windows security principals.
ADAM and Active Directory can run concurrently on the same network. In addition, ADAM can support both domain and workgroup users simultaneously.
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