The biggest misnomer actually comes from the name itself — that is, that “big data” is about big data. I’d argue that the cur rent big data trend only partially deals with its size. For example, a Tbyte of data is nothing for the US National Security Agency (NSA), but is probably a lot for an indi vidual. Furthermore, depending on the question asked, a single Gbyte of image data can be as hard to ana lyze as a petabyte of text data. When we talk about big data, we must put its size in relation to the available resources, the question asked, and the kind of data. Moreover, producing a crappy answer quickly is easy. For example, a system always returning 42 as the answer will never really be wrong, but will rarely be helpful. Finally, big data is all about time. How does a precise answer help us if the system requires a year to com pute it? This leads us to a definition we developed at the University of California, Berkeley: