It is a special lookup relationship available for only the user object. It lets users use a lookup field to associate one user with another that does not directly or indirectly refer to itself. Reference : https://help.salesforce.com/articleView?id=overview_of_custom_object_relationships.htm&type=5 (https://help.salesforce.com/articleView?id=overview_of_custom_object_relationships.htm&type=5)
It is a special lookup relationship available for only the user object. It lets users use a lookup field to associate one user with another that does not directly or indirectly refer to itself.
Reference : https://help.salesforce.com/articleView?id=overview_of_custom_object_relationships.htm&type=5 (https://help.salesforce.com/articleView?id=overview_of_custom_object_relationships.htm&type=5)
Thanks,
Dhanya