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An exothermic reaction is a reaction with release of heat. As an example the burning reaction of methane:
CH4 + 2 O2 ------→ CO2 + 2 H2O
... is an exothermic reaction (opposite of 'endothermic')
It is called an exothermic reaction. Example: a burning candle
Heat is released during an exothermic reaction.
In exothermic reactions heat is liberated.
So reaction can be
reactants---->products+heat