Every day we collectively produce 2.5 quintillion bytes of data through social media activity, mobile phones, digital content, emails, sensors, etc. Over the last two years we’ve created 90% of the data in the world today. This is what Big Data is.
From an engineering perspective Big Data is a process whereby large quantities of data are structured, analyzed and modelized in order to make predictions e.g. build predictive models.
Big Data Means Business (May 29th 2012)