A chemical reaction that absorbs heat is called an endothermic reaction. In such reactions, the energy needed for the reaction to proceed comes from the surrounding environment, causing a decrease in temperature. This absorption of heat can be observed in processes such as photosynthesis, where plants convert sunlight into chemical energy, and in the dissolution of certain salts in water. Endothermic reactions are essential in various scientific and industrial applications, including temperature-sensitive processes and sustainable energy solutions. The opposite of endothermic reactions are exothermic reactions, which release heat.