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A network directory service is a shared, organized source of information about network users, computers, groups, servers, and resources. It lets people, applications, and administrators find that information and, depending on the implementation, can support sign-in and access management. Active Directory Domain Services (AD DS) is one example.
What a network directory service does
A directory service keeps descriptions of network objects in a structure that can be searched. An entry might describe a user account, computer, group, server, printer, or shared volume. Each entry has attributes—properties such as a name or other identifying information—and a schema defines which object and attribute types the directory can contain.
People and applications can query the directory to locate entries and read their properties. Administrators can use directory information to organize accounts and resources and manage who can access them. The precise capabilities depend on the directory service; authentication, access control, policy administration, and replication are features of AD DS, not requirements that every directory service must provide.
How directory data is organized and used
Directories are generally designed for concise descriptive information that is searched and read often. Their structure and indexing help clients locate entries without treating the directory like a general-purpose database intended for large amounts of data per record or transaction-and-rollback workflows. Microsoft explains this distinction in its Active Directory Domain Services overview.
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A directory service may keep copies of directory data on multiple systems to improve availability or response time. In a replicated design, changes can take time to reach every copy, so replicas may briefly differ while updates propagate. The exact replication behavior depends on the implementation and its configuration.
Is LDAP a directory service?
No. LDAP, or Lightweight Directory Access Protocol, is a protocol clients can use to connect to an existing directory, search it, and, where permitted, update entries. It is not the directory itself and does not define how a directory service must be built or operate. Microsoft identifies LDAP as the primary access protocol for Active Directory. See its LDAP overview.
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Active Directory Domain Services as an example
AD DS is Microsoft’s directory service for Windows Server environments. It stores information about network objects and makes that information available to users and administrators. Its documented capabilities include a schema, search and indexing, a global catalog for locating objects across domains, authentication, access control, policy-based administration, and replication among domain controllers. These capabilities describe AD DS; other directory services may organize data or provide access and identity functions differently. Microsoft’s overview covers Windows Server 2016, 2019, 2022, and 2025: Active Directory Domain Services.
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