Nazi concentration camps were facilities established by the Nazi regime in Germany and occupied territories during World War II. They were used to imprison millions of people, including Jews, political dissidents, Roma, and others deemed undesirable. Conditions in these camps were horrific, with overcrowding, forced labor, and inadequate food leading to widespread suffering and death. Many concentration camps, such as Auschwitz and Dachau, became infamous for their brutal treatment of inmates. Some camps were also sites of mass extermination, where countless lives were lost in the Holocaust. The legacy of these camps serves as a reminder of the dangers of hatred and intolerance.