Art Appreciation is the knowledge and understanding of the universal and timeless qualities that identify all great art. It is about art. Art appreciation is also known as art criticism. The word criticism here doesn't mean "critical" in the sense taking a aggressive, negative approach to a piece of art, but rather a careful analysis of it.

"Art has a subtle language one that is more felt rather than seen or heard. Learning something about the elements of the art that you would like to appreciate can help you appreciate better. In simple terms, you cannot appreciate a thing if you do not know anything about it. Educating yourself about art is easy. Reading and familiarizing yourself about the type of art you are interested in can go a long way in helping you make out the finer aspects." - Art Appreciation Online