Perestroika: Perestroika was a policy initiated by Soviet leader Mikhail Gorbachev that aimed at restructuring and reforming the Soviet economy. It played a significant role in setting off waves of change throughout Eastern Europe.
Solidarity Movement: The Solidarity Movement was an anti-communist trade union formed in Poland that fought for workers' rights and political freedom during the 1980s. It inspired other pro-democracy movements across Eastern Europe.
Velvet Revolution: The Velvet Revolution refers to the peaceful overthrow of communism in Czechoslovakia (now Czech Republic and Slovakia) in 1989. It served as inspiration for other non-violent revolutions in Eastern Europe.