Concentration camps are facilities where large groups of people are detained, often without trial. These camps are typically used during times of war or political unrest to imprison individuals based on their ethnicity, political beliefs, or other characteristics. The conditions in these camps can be harsh, with limited access to food, medical care, and basic human rights. Historically, one of the most infamous examples of concentration camps was during World War II, when the Nazi regime in Germany imprisoned millions of Jews, Roma, and other groups. These camps were part of a broader system of persecution and genocide, leading to the deaths of millions.