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The Iron Curtain symbolized the ideological fighting and physical boundary dividing Europe into two separate areas from the end of World War II in 1945 until the end of the Cold War in 1991. On either side of the Iron Curtain, states developed their own international economic and military alliances.
so basically it was a boundary separating europe?
More detailed answer:
"Iron Curtain" is a term used to describe the boundary that separated the Warsaw Pact countries from the NATO countries from about 1945 until the end of the Cold War in 1991. The Iron Curtain was both a physical and an ideological division that represented the way Europe was viewed after World War II. To the east of the Iron Curtain were the countries that were connected to or influenced by the former Soviet Union. This included part of Germany (East Germany), Czechoslovakia, Poland, Hungary, Bulgaria, Romania, and Albania (until 1960 when it aligned with China). While Yugoslavia was Communist politically it was not considered to be a part of the Eastern Bloc or behind the Iron Curtain. Josip Broz Tito, the president of Yugoslavia at the time, was able to maintain access with the west while leading a communist country. The other countries to the west of the Iron Curtain had democratic governments.