This is the story of how mankind discovered fire. It is an ancient tale that has been passed down through generations, and it tells of the momentous event that changed the course of human history. Fire was a revolutionary discovery that allowed humans to cook food, stay warm, and create tools.
From Wikipedia
The control of fire by early humans was a critical technology enabling the evolution of humans. Fire provided a source of warmth and lighting, protection from predators, a way to create more advanced hunting tools, and a method for cooking food. These advances allowed human geographic dispersal, cultural innovations, and changes to diet and behavior.