Since Windows 2000 Server, Active Directory features the System Volume (SYSVOL). This shared folder is replicated between all of the domain controllers in an Active Directory domain and contains commonly-accessed files such as Group Policy objects, logon scripts, and logoff scripts and can hold any file an Active Directory admin wants it to hold.
In legacy Active Directory environments, SYSVOL replication uses the File Replication Service (FRS). This should be migrated to Distributed File System Replication (DFSR).