Articles in this encyclopedia have addressed various questions related to the causes, consequences, and implications of intergroup conflict, peacebuilding, justice, and reconciliation. This article will discuss the phenomenon of empathy conceptualized as an emotional reaction or an emotional response to knowing about the suffering of others. The question of how people tend to react to knowledge about the suffering or killing of others and why empathy is a desired reaction will be analyzed. First, however, it is necessary to define what empathy is and what it is not. Then it will be explained why it is important to be emotionally moved by others' suffering. Finally, the article will attempt to shed some light on the question as to why some people feel empathy while others feel nothing at all.