A water mist extinguisher is a type of fire extinguisher that uses fine water droplets to extinguish fires. The mist cools the flames and displaces oxygen, effectively smothering the fire. It is particularly effective on Class A fires, which involve ordinary combustibles like wood and paper, and can also be used on some Class B fires, such as flammable liquids. These extinguishers are safe for use on electrical fires, making them versatile for various environments, including offices and industrial settings. The fine mist reduces water damage compared to traditional water extinguishers, making them a practical choice for sensitive areas.