Entertaiment can be anything that is done for enjoyment, relaxation or amusement. This includes watching movies or television shows, playing games, listening to music, reading books, playing sports, and visiting art galleries and museums. Entertaiment can also be activities that involve a physical challenge or competition, such as athletic events or contests. The idea of entertainment can vary greatly from culture to culture and even within a single society. Often entertainment hits on points that the human brain was evolved to deeply react to. It can include themes like social backstabbing and murders, which were important to understand in order to function in the social world.