Unstructured Data
Until recent years, most data was structured, the kind of alphanumeric information (such as financial data from sales transactions) that could be easily stored in a relational database and analyzed by business intelligence tools.
But, a big chunk of the 2.7 zettabytes of stored data today is unstructured, such as text-based documents, tweets, photos posted on Flickr, videos posted on YouTube and so on. (Fun fact: Thirty-five hours of content are uploaded to YouTube every minute.)
Processing, storing and analyzing all that messy unstructured stuff are often challenges for today's IT systems.
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