Fire is a chemical reaction that takes a fuel source and breaks it down into other molecules (usually water and Co2), producing light and heat. We perceive this light and heat as flame. 

For example, when methane burns, it uses oxygen to break down the methane (CH4) into the water. This produces light and heat

CH4 + 2 O2 → CO 2 + 2 H 2 O + 890 KJ

Methane + 2 Dioxygen = 2 Water and Energy (Light and Heat)
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