Friendship

Friendship is a relationship of mutual affection between two or more people. Friendship is a stronger form of interpersonal bond than an association. Friendship has been studied in academic fields such as 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. A World Happiness Database study found that people with close friendships are happier.

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, 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.

While there is no practical limit on what types of people can form a friendship, friends tend to share common backgrounds, occupations, or interests and have similar demographics.

Conventional wisdom suggests that good friendships enhance an individual's sense of happiness and overall well-being. Indeed, a number of studies have found that strong social supports improve a woman's prospects for good health and longevity. Conversely, loneliness and a lack of social supports have been linked to an increased risk of heart disease, viral infections, and cancer, as well as higher mortality rates overall. Two researchers have even termed friendship networks a "behavioral vaccine" that boosts both physical and mental health.

While there is an impressive body of research linking friendship and health, the precise reasons for the connection remain unclear. Most of the studies in this area are large prospective studies that follow people over a period of time, and while there may be a correlation between the two variables (friendship and health status), researchers still do not know if there is a cause and effect relationship, such as the notion that good friendships actually improve health. A number of theories have attempted to explain this link. These theories have included that good friends encourage their friends to lead more healthy lifestyles; that good friends encourage their friends to seek help and access services when needed; that good friends enhance their friends' coping skills in dealing with illness and other health problems; and that good friends actually affect physiological pathways that are protective of health.