NTDS.DIT
The role of ESE in an active directory is to store and retrieve data through indexed and sequential access.Its the data storage technology from Microsoft.
Windows 2000 Active Directory data store, the actual database file, is %SystemRoot%\ntds\NTDS.DIT
The schema is the Active Directory component that defines all the objects and attributes that the directory service uses to store data.
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Active Directory is called active bacause it is actively updating it's data through replication from differnt sites and other domain controllers with in the network
Active Directory service is used to store information about the network resources across a domain and also centralize the network.
At Active Directory configuration partition
DomainDNSzones
Schema
Active Directory Recycle Bin helps minimize directory service downtime by enhancing your ability to preserve and restore accidentally deleted Active Directory objects without restoring Active Directory data from backups.By default, Active Directory Recycle Bin in Windows Server 2008 R2 is disabled. To enable Active Directory Recycle Bin, your environment must meet the requirements to completed scenarioused to restore object deleted form AD or restore Multi OUs.