Art with no defined meaning. Its purpose is to let the viewer interpret its meaning for him/herself. More often than not, abstract art is a collection of meaningless shapes and colors thrown onto a canvas. The intellectual art community, however, looks at this and calls the author a genius, promptly shelling out tons of money to buy a mess that could have been accidentally created by a two year old.
If you can't draw or paint but still want to earn millions of dollars as an artist, don't worry: Abstract art is for you!