Dry powder fire extinguishers are versatile devices used to combat various types of fires, including those involving flammable liquids and electrical equipment. They contain a dry chemical powder, typically monoammonium phosphate, which smothers flames and interrupts the chemical reaction of the fire. These extinguishers are effective for Class A, B, and C fires, making them suitable for both home and industrial use. When using a dry powder fire extinguisher, it's important to remember 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 the extinguisher is in good working condition and ready for use in an emergency.