Domain Controller
Noun · Security & Infosec
Definitions
A server that authenticates users and computers, enforces directory policies, and stores identity data in an Active Directory domain. Domain controllers are among the most sensitive systems in enterprise networks because they anchor trust and access.
In plain English: A central server that manages logins and policy in a Windows domain.
Example: "The incident escalated when the attacker reached a domain controller and began querying directory data directly."