Assuming you mean the name: an exothermic reaction.
A reaction that releases energy is usually termed exothermic reaction. Energy is usually released as heat.
Energy is released during a decomposition reaction.
chemicial reaction
exothermic reaction
In an exothermic reaction heat energy is released.
Energy and Heat of a reaction is the net amount of energy released or absorbed when the reaction is 100% complete
Nuclear Energy
The reaction in which energy is being released, and the overall energy change (enthalpy) is negative.
energy released by the reaction or energy absorbed.
Heat energy is released in an exothermic chemicalreaction.
exothermic reaction
The energy release of an exothermic reaction is released to the surroundings.