What is Active Directory?
Active Directory (AD) is a directory service developed by Microsoft for Windows domain networks.
It is included in most Windows Server operating systems as a set of processes and services.
Initially, Active Directory was used only for centralized domain management. However, Active Directory eventually became an umbrella title for a broad range of directory-based identity-related services.
A server running the Active Directory Domain Service (AD DS) role is called a domain controller. It authenticates and authorizes all users and computers in a Windows domain type network, assigning and enforcing security policies for all computers, and installing or updating software.
For example, when a user logs into a computer that is part of a Windows domain, Active Directory checks the submitted username and password and determines whether the user is a system administrator or normal user.
Active Directory uses Lightweight Directory Access Protocol (LDAP).
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