Auschwitz :concentration camp) was a network ofconcentration and extermination camps built and operated by the Third Reich in Polish areas annexed by Nazi Germanyduring 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.                                                                                                                                                                                                                                 HOLOCAUST:                                                                                                                                Destruction or slaughter on a mass scale, especially caused by fire or nuclear war:a nuclear holocaust The mass murder of Jews under the German Nazi regime during the period 1941-5. More than 6 million European Jews, as well as members of other persecuted groups, were murdered at concentration camps such as Auschwitz.