Empathy is an emotion believed to be a distinctive quality of the human species. When we see another human or animal experiencing something positive or negative, we instinctively identify with the other part. If the other part is in pain we feel bad, and if the other part is experiencing joy, we feel glad for them.

Empathy is a reflex emotion that has to be learned at a young age. Not all humans have empathy: the lacking of all forms of empathy is called psychopathy (see also antisocial personality disorder). Autism and Asperger's disorder are often falsely associated with empathy disorders, due to developmental differences in the ways emotions are experienced and expressed.

Closely related concepts are compassion and sympathy, but in difference from sympathy, empathy does not involve abstract reasoning.

The empathy reflex is exploited to a certain extent in all kinds of fiction, thus we may identify deeply with characters appearing in a text or on a screen. It is also possible to identify with a person of the other sex or an animal. Empathy is thought to be a driving psychological force behind the animal rights movement.

Some students of animal behaviour claim that empathy is not restricted to humans as the definition implies. Examples include dolphins saving humans from drowning or from shark attacks, and a multitude of behaviours observed in primates, both in captivity and in the wild. See, for instance, the popular book

Frans de Waal, The Ape and the Sushi Master.

In science fiction, empathy (and the cooresponding noun empath) is used to signify a paranormal ability to sense the emotions of others, as opposed to telepathy, which allows one to perceive thoughts as well.