Entertaiment is a broad category of things that can be viewed and enjoyed for pleasure. Entertainment is often considered to be anything that stimulates the brain to release seratonin, dopamine and other chemicals that are good for you. Entertainment can also be viewed as any activity that a person or group of people enjoys for its own sake. Some examples of entertainment are movies, books and TV shows. Many of these things have been around for a long time, demonstrating their popularity. This may have to do with the fact that they often hit on themes that our brains were shaped to react deeply to.