Auschwitz concentration camp was a network of German Nazi camps established during World War II, primarily in occupied Poland. It became one of the most notorious sites of the Holocaust, where millions of Jews, Romani people, and other targeted groups were imprisoned, forced into labor, and systematically murdered. The camp consisted of three main parts: Auschwitz I, the administrative center; Auschwitz II-Birkenau, which served as a killing center; and Auschwitz III-Monowitz, focused on labor. The camp's liberation by Soviet forces in January 1945 revealed the extent of the atrocities committed there, making it a symbol of the horrors of the Holocaust.