Entertaiment is a form of recreation or diversion. It can involve a sense of pleasure or amusement, such as when people solve a crossword puzzle or watch a comedy film. It can also mean an agreeable occupation of the mind: the entertainment provided by a book. It can be a purely amusing experience or have a more serious purpose, such as a ceremonial event or a religious festival.
Entertainment can be an immersive experience that a person can enjoy at any scale, from one-to-one interaction to large-scale public performances intended for thousands of people. It often hits on themes that the human brain was shaped to respond deeply to, such as murders, backstabbing, and other social themes. It can also stimulate the brain to release seratonin and dopamine, wich gives you a nice feeling.