According to arrhenius what is the difference between an acid and a base

Arrhenius concept just states that if a solution dissociates and forms H+ ions then its an acid, but if it dissociates and forms OH- than it's a base.

Exothermic reactions are chemical reactions that release energy. Example: Burning a candle is an example of an exothermic reaction because energy is being released during the reaction in the form of heat. Endothermic reactions are chemical reactions that absorb energy.