mabb is the joint media authority of the German federal states Berlin and Brandenburg. On a national level, mabb exercises its supervising tasks, which include issuing licenses and overseeing private radio and television broadcasters, in cooperation with the media authorities of the respective federal states.

Following its legal mandate mabb is implementing educational projects promoting media skills and training, as well as new transmission technologies. ALEX Open Channel Berlin and the Media Innovation Center Babelsberg (MIZ) are sponsored by mabb in order to support this mission.