In order to really understand Art, we have to talk briefly about the context in which Art exists-- culture.
Culture is a basic part of the human experience as social animals. Our culture organizes our world and gives us roles to play it. Some aspects of cultures seem to make people happier overall, and some make people less happy, but all cultures are internally logically consistent.
In all parts of the world, cultures are shared and passed down through stories. Not only fairy tales and children's books, but all forms of expression tell us stories in some way. What do friends do when they get together over beer or wine? They tell stories. What do we do when we go home and want to relax? We watch stories on TV, or read them in books, or experience them in video games. It is an important and fulfilling experience to connect with one another through our stories, and in doing so, we create, change and reinforce the concepts that our culture consists of.