PDC (Primary Domain Controller)

A PDC (Primary Domain Controller) is a server in a Windows network that manages user accounts, passwords, and security settings for the entire network. It authenticates users when they log in and controls access to resources like files and printers. The PDC serves as the main authority for security policies and ensures that users have proper permissions. In essence, it acts as the central "manager" for user identity and access within an organization’s computer environment, coordinating security and user management functions across connected devices.