Entertaiment is anything that holds one’s interest and gives pleasure and delight. It can be an idea or a task, but is more likely to be one of the activities that have developed over thousands of years specifically for the purpose of holding attention. It can also be a hobby, sport or activity that you enjoy doing.
Entertainment hits on the points that the mind was evolved to react deeply to in order to function as a social creature. Entertainment often involves backstabbing, murders and other themes that the mind was shaped to understand as an essential part of the world in which we live.