Describe prosocial behavior.

Answers will vary. Prosocial behavior, also known as altruism, is intended to benefit another without expectation of reward. Prosocial behavior includes sharing, cooperating, and helping and comforting others in distress. It is shown by the preschool and early school years and is linked to the development of empathy and perspective taking.
Empathy is sensitivity to the feelings of others and is connected with sharing and cooperation. Infants frequently begin to cry when they hear other children crying, although this early agitated response may be largely reflexive. Empathy promotes prosocial behavior and decreases aggressive behavior, and these links are evident by the second year.
According to Piaget, preoperational children tend to be egocentric. They tend not to be able to see things from the vantage points of others. It turns out that various cognitive abilities, such as being able to take another person's perspective, are related to knowing when someone is in need or distress. Perspective-taking skills improve with age, and so do prosocial skills. Among children of the same age, those with better developed perspective-taking ability also show more prosocial behavior and less aggressive behavior.