Emotions are mental and physiological states associated with psychological changes, internal or external stimuli, natural or learned. According to most modern theories, emotions are a multicomponent process, that is articulated in several components and with an evolving temporal course. Emotion is often intertwined with mood, temperament, personality, disposition, creativity and motivation.

In evolutionary or Darwinian terms, their main function is to make the individual’s reaction to situations in which an immediate response for survival is necessary, a reaction that does not use cognitive processes and conscious processing, is more effective.