“So, what is Big Data? There are two common sources of data grouped under the banner of Big Data. First, we have a fair amount of data within the corporation that, thanks to automation and access, is increasingly shared. This includes emails, mainframe logs, blogs, Adobe PDF documents, business process events, and any other structured, unstructured, or semi-structured data available inside the organization. Second, we are seeing a lot more data outside the organization some available publicly free of cost, some based on paid subscription, and the rest available selectively for specific business partners or customers. This includes information available on social media sites, product literature freely distributed by competitors, corporate customers’ organization hierarchies, helpful hints available from third parties, and customer complaints posted on regulatory sites” (from “Big Data Analytics”, Arvind Sathi, 2013)
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