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ADDS are the foundation for distributed networks built on Windows 2000 /2003 /2008 operating systems that use DCs. ADDS provide secure, structured, hierarchical data storage for objects in a network (e.g users, computers, printers, and services); provide support for locating and working with these objects.
Active Directory Domain Services or AD DS is a Windows Server service that stores Active Directory data and helps managing the communication between Active Directory users and domains. The AD DS tasks also includes keeping up with user logon processes, authentication, and searches within the Active Directory.
Note: Radu Grigorescu's answer is right as well.
Active Directory Domain Services basically a server role in Active Directory and that allows admin to manage and store information and about resources from network, more as application data, in a distributed database.
ACTIVE DIRRECTORY SERVICES IS HAI SENTALIZE MANAGEMANT CONSOLE
Active Directory Domain Service Was Store Data Of Users , printer , and Computers . we cann monitor handle and control that things centrally
A directory is a hierarchical structure that stores information about objects on the network. A directory service, such as Active Directory Domain Services (AD DS), provides the methods for storing directory data and making this data available to network users and administrators. For example, AD DS stores information about user accounts, such as names, passwords, phone numbers, and so on, and enables other authorized users on the same network to access this information.
Active Directory stores information about objects on the network and makes this information easy for administrators and users to find and use. Active Directory uses a structured data store as the basis for a logical, hierarchical organization of directory information.
This data store, also known as the directory, contains information about Active Directory objects. These objects typically include shared resources such as servers, volumes, printers, and the network user and computer accounts. For more information about the Active Directory data store, see Directory data store.
Security is integrated with Active Directory through logon authentication and access control to objects in the directory. With a single network logon, administrators can manage directory data and organization throughout their network, and authorized network users can access resources anywhere on the network. Policy-based administration eases the management of even the most complex network.
Schema
Global Catalog
Query & Index Mechanism
replication Service
A directory is a hierarchical structure that stores information about objects on the network. A directory service, such as Active Directory Domain Services (AD DS), provides the methods for storing directory data and making this data available to network users and administrators. For example, AD DS stores information about user accounts, such as names, passwords, phone numbers, and so on, and enables other authorized users on the same network to access this information.
Active Directory is a Service to connect with User's and Domain servers.
Its like a database which stores all the User's Information.