Question

What does exothermic

Answer 1

An exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy. Exothermic Reaction means "exo" meaning releases and "thermic" means heat. 

hope it relates and helps.

Answer 2

Exothermic means which release energy through light or heat