In this lesson, we explore the use cases and functionality of Delegated Administration. Use delegated administration to assign limited admin privileges to users in your org who aren’t administrators. For example, let’s say you want the Customer Support team manager to manage users in the Support Manager role and all subordinate roles. Create a delegated admin for this purpose so that you can focus on other administration tasks.
Delegated Administration - https://help.salesforce.com/articleView?id=admin_delegate.htm&type=5