P { margin-bottom: 0.21cm; }A:link { }21stCentury is well known as the age of digitization. Intoday’s world, data is produced by almost every imaginable entity. Before the advent of this digital era, traditional data comprised ofonly hard data.

Hard data comprises of numbers, bank transactionrecords, call records etc. The amount of data that isbeing created and stored nowadays is exploding. Every day 2.5quintillion bytes of data are created and 90% of the data in theworld today was produced within the past two years. Example of thisdata include high sensor data and social networking information fromweb sites such as Facebook, Flickr and Twitter. 100 terabytes of dataare uploaded daily to Facebook.

Akamai analyses 75 million events aday to target online ads. Walmart handles 1 million customertransactions every single hour. 90% of world’s data ever created wasgenerated in the past 2 years. Data is also generated from otherdifferent and diverse sources such as banking transactions, digitalimages, videos, audios and click streams for domains includinghealthcare, retail, energy and utilities. This content is big data.Big data is arriving from multiple sources at an alarming velocity.Every minute, every day, 100 hours of video are uploaded on YouTube,200 million emails are send over and 300,000 tweets are sent.

Velocity in this context refers to the increasing speed at whichthis data is created, and the increasing speed at which the data canbe processed, stored and analyzed. One way of looking at big data isthat it represents the large and rapidly growing volume ofinformation that is mostly untapped by existing analyticalapplications and data warehousing systems. 90% of data generated isunstructured coming in all shapes and forms from geo- spatial datato tweets which can be analyzed for content and sentiment, to visualdata such as photos and videos. Data that is being produced isusually structured, semi-structured or structure less.

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