Combustion is a chemical reaction.This is mostly thermal energy but, heat and sound energy can be released. that happens when a substance reacts with oxygen, usually from the air, and produces heat and light. It's like a process where something burns. For example, when you light a candle, the wax undergoes combustion as it reacts with the oxygen in the air, releasing heat and light in the form of a flame. In simpler terms, combustion is the process of something catching fire and burning.
