Endothermic Reaction:A chemical reaction that absorbs heat from its surroundings. It's considered non-spontaneous as it requires continuous energy input.
Activation Energy:The minimum amount of energy required to initiate a chemical reaction, often supplied externally for non-spontaneous processes.
Endergonic Reaction:A reaction that requires energy in order to proceed, similar to endothermic reactions but specifically referring to changes in Gibbs Free Energy.