Entertaiment is a diverse collection of entertainment media and related material that spans the history of digital content creation. It includes the full spectrum of film, television, music, books, games and interactive media, as well as cultural and social events and activities. Although entertainment often appears to be a frivolous activity, many of its familiar forms have a serious purpose. They may be used to entertain oneself, or they may be part of ceremonies, celebrations, religious festivals or satires for an audience. Many entertainment themes have also proven to be deeply resonant, reflecting the ways that the human brain was evolved to react emotionally to important issues like backstabbing and murders.