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 over the nose and mouth, along with a filter that removes toxic gases, chemicals, and particulates. Gas masks are commonly used in situations involving chemical warfare, industrial accidents, or hazardous materials. These masks are essential for first responders, military personnel, and workers in environments where exposure to dangerous substances is possible. They help ensure safety by allowing the wearer to breathe clean air, even in contaminated areas. Proper training and maintenance are crucial for effective use.