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Table 2 Four definitions of big data

From: Applications of big data to smart cities

SAS: “Big data is a popular term used to describe the exponential growth, availability, and use of information, both structured and unstructured” [7].  
IBM: “Data, coming from everywhere; sensors used to gather climate information, posts to social media sites, digital pictures and videos, purchase transaction record, and cell phone GPS signal to name a few” [7].  
“Big Data is defined as large set of data that is very unstructured and disorganized” [20].  
“Big data is a form of data that exceeds the processing capabilities of traditional database infrastructure or engines” [20].