Entertaiment is an act of providing amusement and pleasure. It can also be a form of entertainment that holds and keeps the attention of an audience, such as a show. The word entertain comes from the Middle English entretenement, from the Medieval Latin inter tenere, with the prefix inter meaning “inside” and the suffix tenere, related to the Indo-European root ten, which means to hold or sustain.
A lot of entertainment hits on subjects that the brain was evolved to understand and react deeply to such as murders, backstabbing and other social themes. Entertaining stories often stimulate the brain to realease seratonin and other chemicals.