Endothermic is a process or reaction that absorbs energy in the form of heat. Endothermic reactions feel cold because it is taking heat away. Breaking a chemical bond is endothermic because it needs energy.
Endothermic processes include melting an ice cube, cooking an egg, evaporating liquid water, splitting a gas molecule and baking a loaf of bread. Endothermic reactions happen when more energy is needed to break existing bonds in the reactants than is released when the new bond forms. Endothermic reactions include dissolving ammonium chloride in water, mixing water and ammonium nitrate and mixing water with potassium chloride. Photosynthesis is also an example of an endothermic reaction. It is the process by which plants use sunlight to produce food and energy.