What are the four types of Active Directory container objects?

The four types of Active Directory container objects are Organizational Units (OUs), domains, sites, and the built-in container. Organizational Units are used to organize users, groups, and devices for management and delegation of permissions. Domains represent a logical group of objects within the directory, while sites are used to manage replication and network topology. The built-in container holds default groups and accounts that are created with Active Directory.