Entertaiment is a way of relaxing and having fun. It can stimulate the brain to realease seratonin, dopamine and other chemicals. Entertainment can also be cathartic, it can show us things we were evolved to react to deeply in order to understand the world, like social backstabbing and murders.
Entertainment can be as simple as a play on the playground or as complex as a fine art exhibition. People might prioritize different forms of entertainment depending on their mood; for example, some people may prefer lighthearted comedy shows while others may favor more thought-provoking entertainment, such as documentaries, puzzles, or video games that require strategic thinking.