Entertaiment is the art of absorbing and entertaining people.
We all live busy lives, chasing the next big paycheck, and we can easily get bored with a lack of entertainment. Adding some form of entertainement can help us relax and connect with our friends and family.
Entertainment often hits on the themes the brain was shaped to deeply react to in a social world. This is why backstabbing, murders and other dark themes are often used in entertainment.