Active fire protection is a group of systems that require some amount of action or motion in order to work efficiently in the event of a fire. Actions may be manually operated, like a fire extinguisher or automatic, like a sprinkler but either way they require some amount of action. Active fire protection includes fire/smoke alarm systems, sprinkler systems, and fire extinguishers as well as firefighters. Fire/smoke alarm systems are used to detect whether there is fire or smoke in a building. Sprinkler systems are used to help slow the growth of the fire.