Newsgroups are organized hierarchically. All these groups have the same rules for creating new subgroups. Someone can propose to start a new newsgroup, and a voting procedure will decide whether the newsgroup will indeed be created or not. Within a top hierarchy, there can be several subhierarchies. Such a subhierarchy can be divided even further.
Control is a special newsgroup, used to send the commands for creation or deletion of newsgroups.
News servers have to pay if they wish to receive those commercial newsgroups. Newsgroups like be or kuleuven are only distributed within Belgium or K.U.Leuven.