Extinguishers are portable devices designed to put out fires. They contain various agents, such as water, foam, dry powder, or carbon dioxide, which help to smother flames and cool down hot surfaces. Each type of extinguisher is suited for specific classes of fires, such as those caused by wood, flammable liquids, or electrical equipment. Using an extinguisher effectively requires knowledge of the PASS technique: Pull the pin, Aim the nozzle, Squeeze the handle, and Sweep from side to side. Regular maintenance and inspections are essential to ensure that extinguishers are in working order and ready for use in emergencies.