Active Directory

Active Directory (AD) is a Microsoft directory service used in Windows domain networks that provides a centralized, hierarchical framework for managing and securing network resources such as users, computers, groups, and applications. It serves as the backbone of identity and access management (IAM) within enterprise environments, handling user authentication and authorization to ensure that only legitimate users and devices can access specific resources. AD stores critical information about every entity on the network and enables administrators to define permissions, deploy software, and enforce security policies through mechanisms like Group Policy, all while leveraging standard protocols such as LDAP.

From a cybersecurity perspective, Active Directory is one of the most critical infrastructure components to protect. Because it acts as the primary gatekeeper for access to sensitive data and systems, a compromised AD environment can give attackers broad control over an entire organization's network. Secure configuration, continuous monitoring, and hardening of Active Directory are essential practices for defending against threats such as lateral movement, privilege escalation, and credential-based attacks.