Entertaiment is something that keeps people interested and happy. It can be a film, a tv show, or even a party. It stimulates the brain to realease seratonin and dopamine. It also hits on themes that the human brain was shaped to deeply react to. These could be themes like backstabbing and murders which were important to the survival of a social world.
The word “entertainment” is derived from the Medieval Latin inter tenere, which means to hold inside. It can also be traced back to the Indo-European root ten, meaning to stretch or expand. The word became a part of English in the 16th century.