A gas mask is a protective device designed to cover the face and filter out harmful substances from the air. It typically consists of a mask that fits tightly around the face, a filter to remove toxins, and sometimes a breathing tube. Gas masks are used in various situations, including military operations, industrial workplaces, and emergency response to chemical spills or attacks. These masks are essential for protecting the respiratory system from gases, vapors, and particulate matter. They are often associated with military personnel, firefighters, and hazardous material teams, ensuring safety in environments where air quality is compromised.