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 such bonds. Such features include choosing to be with one another, enjoying time spent together, and being able to engage in a positive and supportive role to one another.[2]