Friendship is a relationship of mutual affection between people. Friendship is a stronger form of interpersonal bond than an association. Friendship has been studied in academic fields such as communication, sociology, social psychology, anthropology, and philosophy. Various academic theories of friendship have been proposed, including social exchange theory, equity theory, relational dialectics, and attachment styles.
Although there are many forms of friendship, some of which may vary from place to place, certain characteristics are present in many types of bond. Such characteristics include affection; kindness; love; virtue; sympathy; empathy; honesty; altruism; mutual understanding and compassion; enjoyment of each other's company; trust; and the ability to be oneself, express one's feelings, and make mistakes without fear of judgment from the friend.
The understanding of friendship in children tends to be more heavily focused on areas such as common activities, physical proximity, and shared expectations. These friendships provide opportunity for playing and practicing self-regulation. Most children tend to describe friendship in terms of things like sharing, and children are are more likely to share with someone they consider to be a friend. As children mature, they become less individualized and are more aware of others. They gain the ability to empathize with their friends, and enjoy playing in groups. They also experience peer rejection as they move through the middle childhood years. Establishing good friendships at a young age helps a child to be better acclimated in society later on in their life.