Gas chambers are enclosed spaces designed to kill individuals using toxic gases. They were infamously used during the Holocaust by the Nazi regime to execute millions of people, primarily Jews, as part of their systematic genocide. The chambers were often disguised as showers to deceive victims about their true purpose. The process involved filling the chamber with poisonous gas, such as Zyklon B, which caused death through asphyxiation. Gas chambers represent one of the most horrific methods of mass murder in history, highlighting the extreme consequences of hatred and intolerance.