Auschwitz concentration camp (German: Konzentrationslager Auschwitz) was a network of concentration and extermination camps built and operated by the Third Reich in Polish areas annexed by Nazi Germany during World War II. It consisted of Auschwitz I (the original camp), Auschwitz II–Birkenau (a combination concentration / extermination camp), Auschwitz III–Monowitz (a labor camp to staff an IG Farben factory), and 45 satellite camps.

http://en.wikipedia.org/wiki/Auschwitz_concentration_camp