Many people and institutions possess considerable volumes of data which may'hide'some fundamental relation which could be exploited to advantage: estate agents, banks, medical researchers, fraud investigators and many others would like to be able to view some graphical presentation of that data and perhaps interact with it and, at some point, be able to say "Ah Ha! Now that is interesting!" That is what Information Visualization is all about: it is the process of forming a mental model of data, thereby supporting insight into that data.