The PermissionController is a component of the Android operating system that controls which privileges apps have. It is responsible for handling permission-related UI, logic, and roles to allow access for apps for specific purposes. The PermissionController module contains privacy policies and the UI related to granting and managing permissions. It controls runtime permission granting, management, and usage tracking, as well as roles. The PermissionController interacts with the framework only via stable @SystemApi (no @hide API usage) and handles permission-related intents with priority > 0. It also provides services to which the system and applications can bind, including role management, permission revocation, and basic permission information (for Settings) . The PermissionController supports auto-revoke for unused apps, which is new in Android 11.

In summary, the PermissionController is a tool that allows users to manage app permissions on their Android devices. It controls which apps have access to certain features and information on the device, and it provides users with the ability to approve or deny access to new apps.