Firefighting foam is a specialized substance used to extinguish fires, particularly those involving flammable liquids like gasoline or oil. It works by creating a blanket of foam that smothers the flames, cutting off the fire's oxygen supply and cooling the burning material. This makes it effective in preventing re-ignition. There are different types of firefighting foam, including Aqueous Film Forming Foam (AFFF) and Protein Foam. Each type is designed for specific fire scenarios and is commonly used by fire departments and in industrial settings. The foam is typically delivered through hoses or specialized equipment to ensure effective coverage of the fire.