Berlin Wall: The Berlin Wall was a physical barrier constructed by East Germany to divide East Berlin from West Berlin during the Cold War. It symbolized the division between capitalist and communist ideologies.
Stasi: The Stasi refers to the Ministry for State Security in East Germany, which operated as an extensive secret police force with broad surveillance powers over citizens suspected of being disloyal to the government.
Ostpolitik: Ostpolitik refers to West Germany's policy towards Eastern Europe during the Cold War, aimed at improving diplomatic relations with countries such as East Germany and Poland in order to reduce tension and promote cooperation.