A reaction that absorbs heat from its surroundings is termed an endothermic reaction. In such reactions, the system requires energy input, typically from the surrounding environment, resulting in a temperature drop in that environment. Endothermic reactions are crucial in various biological and chemical processes, such as photosynthesis, where plants absorb light energy. Understanding endothermic reactions is fundamental in thermodynamics and helps explain energy transformations in both natural and artificial systems, influencing everything from climate change to energy production.