Totalitarianism is a type of regime wherein a charismatic leader will be in charge of making decisions for the people, especially in the political, social, and cultural aspects. Fascism is somewhat related to totalitarianism, but this is considered to be more controlling. The leader would like to have total control of the things that people would need to do.
They also do not have any patience for opinions that oppose the views of the leader. If they find out that some people do not agree with what they believe in, they would take note and do things to stop the opposite belief or opinion from spreading to other people.