Suddenly, the big data is everywhere. Big data is huge (pun intended). The buzz around big data itself is pretty big. How big is big data after all? IDC says that in 2010, the size of digital universe cracked the zettabyte barrier. How big is a zettabyte: That would be a giga-giga-kilo – that is 21 zeroes after 1 or 1,000,000,000,000,000,000,000.