The presence of a catalyst affects the activation energy of a reaction by lowering the activation energy, helping the reaction go faster and making it so the reaction does not have to use as much energy to fulfill the products.

activation energy ( I know it is right because it is in my science book)

i think its boom ch boom

An exergonic reaction is activation energy (or energy of activation).

An endergonic reaction is essentially the opposite of an exergonic reaction.

Activation just means making something start up. There is an activation fee for that website. You have to have an activation code to load that software.