!!! Overview
[{$pagename}] is a container object within [Microsoft Active Directory] that contains the deleted objects. 

When an entry is deleted [Microsoft Active Directory] sets the [isDeleted] attribute of the deleted object to [TRUE] and move it to a special container called [{$pagename}], previously known as CN=Deleted Objects.

[{$pagename}] container cannot be accessed through Windows Directories or through [Microsoft Management Console] ([MMC]) snap-ins. However, [{$pagename}] are available to Directory Replication Process, so that the [{$pagename}]s are replicated to all the [Domain Controller] in the domain. 
This process ensures that the object deleted is deleted from all the computers throughout the Active Directory.

[tombstoneLifetime] [attribute] determines the time period after which the object is physically deleted from the [Microsoft Active Directory]. The default value for the tombstone lifetime attribute is 60 [days]. However, you can change this value if required. 

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]