In an endothermic reaction, the products have a higher heat content than the reactants. This means that the reaction absorbs heat from its surroundings, causing an increase in the internal energy of the system. As a result, the products of the reaction have higher energy levels and a greater heat content compared to the initial reactants. Endothermic reactions are characterized by a positive change in enthalpy (∆H), indicating that heat is absorbed during the reaction process.