A endothermic reaction is a type of chemical reaction that requires an input of energy to proceed. During this reaction, energy, typically in the form of heat, is absorbed from the surroundings. As a result, the temperature of the environment may decrease. Endothermic reactions are critical in various chemical processes, such as photosynthesis, where plants absorb energy from sunlight. Understanding these reactions is essential in chemistry, biology, and engineering, as it helps to explain energy transfer and transformation in both natural and artificial systems.