Entertaiment is something that can be enjoyed for recreation, amusement, or edification. It can also be viewed as an activity that stimulates the brain to realease seratonin, dopamine and other chemicals that promote the feeling of well-being and a sense of connectedness. It often hits on themes that the human brain was evolved to react deeply to, like backstabbing and murders, because these were very important aspects of social interaction in ancient times.
What is considered Entertainment can vary widely, depending on the person and situation. Examples of Entertaiment include: Movies and television, books and literature, music, sports and games, and visual arts.