A totalitarian regime is defined by the concentration of power in a single political authority that seeks to control all aspects of public and private life. In such systems, dissent is suppressed, and governmental authority assumes a dominant role in shaping ideology, culture, and social institutions. Totalitarianism typically involves the use of propaganda, mass surveillance, and state-sponsored violence to maintain control and eliminate opposition. Examples include regimes like those of Stalin in the Soviet Union and Hitler in Nazi Germany, characterized by extreme nationalism and authoritarian governance.