Humor research (also humor studies) is a multidisciplinary field which enters the domains of psychology, philosophy, linguistics, sociology, history and literature. More recently, computational humor, a subdomain of the computer science and artificial intelligence emerged, which uses computers to model humor. Research in humor has been done to understand the psychological and physiological effects, both positive and negative, on a person or groups of people. Research in humor has revealed many different theories of humor and many different kinds of humor including their functions and effects personally, in relationships, and in society.