Gas rooms were enclosed spaces designed to administer lethal gas, primarily used during the Holocaust by the Nazi regime. These rooms were often disguised as showers to deceive victims, who were led to believe they were entering a facility for hygiene purposes. The use of gas rooms was part of the broader system of extermination camps, where millions of people, particularly Jews, Romani people, and others deemed undesirable, were systematically murdered. The most infamous of these camps was Auschwitz, where gas chambers became a symbol of the atrocities committed during World War II.