The type of reaction that releases more energy than it consumes is called an exothermic reaction. In these reactions, the total energy of the products is lower than that of the reactants, resulting in a net release of energy, often in the form of heat or light. Common examples include combustion reactions, such as burning fuels, and cellular respiration, where glucose is metabolized to produce energy for biological functions. Exothermic reactions are crucial in numerous chemical and biological processes.