This master thesis concerns the understanding of humor in a psychological viewpoint. Through analysis and discussion it will try to answer the questions; what is humor and how does it affect human social life? The main concepts; humor is in this master thesis defined as an ability to make people laugh, and often appreciate funny things. This requires several physical processes in the body, brain and furthermore awakens positive emotions. Humor can also be accredited several other characteris-tics; as the material which wakens mirth, as a form of play, and a form of communication. Social life can be defined as the ways in which people are connected and the fact that their actions are connected. It implies networks, connections, dependence and separation between people. The Method of approach has been inspired by anthropological psychology. The question of in-vestigation is therefore analyzed and discussed in three perspectives: a natural- , life- and cul-tural-historical perspective. In the natural-historical perspective, biological and evolutional foun-dation of humor is studied. In the life-historical perspective it is studied how humor is developed in the unique individual and how each person uses humor, and in the cultural-historical perspec-tive it is studied how processes in groups and how the nature of the culture influences humor The Theory in this project is studied through literature in order to obtain a theoretical foundation and classification of humor. Some of the main capacities that have contributed to the understand-ing of humor and its role in human social life are: Boje Katzenelson, Preben Bertelsen, Charles R. Gruner, Richard Alexander, Sigmund Freud, Viktor E. Frankl, Robert W. White, and William H. Marineau. It is concluded that in order to account for what humor is, how humor influence human social life, and some of the different examples of humor, which it is possible to find in everyday life, it is necessary to include a biological-, individual-, group- and cultural level.