If we look at the exothermic meaning, these are the chemical reactions which release energy into the surroundings. As it is clear from its name, "exo" means "to release", and "thermic" means "heat". These reactions are involved in the release of energy. Some of the common examples of exothermic reactions are burning a substance, reactions of fuels, deposition of dry ice, and respiration. Exothermic reactions are warmer than endothermic, and sometimes they can be dangerous with high-rate reactions. The release of energy is due to the formation of new bonds or products at a higher level. At the end of these reactions, the enthalpy change becomes lower. No matter what reaction it is, it requires a lot of energy, which is used to hold the bonds holding the molecules together.