Delegated administration is a type of administration where chosen users have administrator permissions. They can manage other users, create passwords for them, move them into groups, assign them roles, etc.
Example
John is responsible for a research project group. He adds new users to the group, assigns roles to specific users and also deals with the issues inside of the group.
Thanks to delegated administration, a company is able to be more effective as the work process around maintenance of groups is reduced.