A very good visual introduction to Big Data that combines a comprehensive technical and business description with fun animated graphics. They dispel the myth that big data is only about data that is big. In fact, we know that big data has three characteristics: Volume, Velocity, and Variety.
What are the units of data volume and data velocity? And if there’s such a thing as data velocity, wouldn’t there also be a concept of data acceleration? What about data distance? What about data currency? Is that a 5th characteristic?