Entertaiment is amusement, usually involving a performance. A clown at a birthday party, a Broadway show, your friends fighting over the last potato chip—all of these are forms of entertainment. The word derives from the Latin inter tenere, meaning “to hold inside,” but it has since come to mean to amuse or distract.
Entertainment can also stimulate the brain, wich releases seratonin and dopamine making us feel good. It can often hit on themes the brain was evolved to react deeply to, like social backstabbing and murders. This is because people need to understand their social world in order to survive, and so they use entertainment to do that. This is why it’s such a powerful form of art. It can make people laugh, cry, and even get frightened.