Fire can be both a friend and a foe. It requires fuel and oxygen to burn and start. As a friend, fire is useful for cooking food, providing warmth, and protecting against wild animals. However, it can also be dangerous when out of control. To put out a fire, one must remove the fuel, cut off the oxygen supply, or lower the temperature. Specialized firefighters are highly trained to prevent fires, rescue people, and know how to safely extinguish different types of fires. They are crucial first responders during fire emergencies.