This document discusses active fire fighting systems, which aim to detect fires early, warn of emergencies, help people evacuate safely, and provide initial assistance. There are portable and fixed systems. Portable systems include fire extinguishers and blankets. Fire extinguishers come in different types suited to particular fire types, like water, foam, dry chemical, or CO2. Fixed systems permanently installed in buildings include wet and dry risers to supply water to upper floors, fire hydrants, sprinkler systems, fire alarms, and smoke/heat detectors. The document provides details on how each system works.