What is AD replication?

Active Directory (AD) replication is the process by which changes made to the directory data on one domain controller are propagated to all other domain controllers in the domain or forest. It ensures that all domain controllers have a consistent and up-to-date copy of the directory, which is crucial for authentication, authorization, and other core directory services. Replication occurs between domain controllers within a site (intra-site) and between domain controllers in different sites (inter-site). It is commonly used to maintain a unified view of the network resources and user information across an organization.