Big data is a new marketing term that highlights the everincreasing and exponential growth of data in every aspect of our lives. The term big data originated from within the open-source community, where there was an effort to develop analytics processes that were faster and more scalable than traditional data warehousing, and could extract value from the vast amounts of unstructured and semistructured data produced daily by web users. Consequently, big data origins are tied to web data, though today big data is used in a larger context.
I discuss these topics in detail in my book. Visit the book site for "High-Performance Data Mining and Big Data Analytics: The Story of Insight from Big Data" (http://bigdataminingbook.info ).