Data which are very large in size is called Big Data. Normally we work on data of size MB(WordDoc ,Excel) or maximum GB(Movies, Codes) but data in Peta bytes i.e. 10^15 byte size is called Big Data. It is stated that almost 90% of today's data has been generated in the past 3 years.
These data come from many sources like
Social networking sites Facebook, Google, LinkedIn all these sites generates huge amount of data on a day to day basis as they have billions of users worldwide.
E-commerce site Sites like Amazon, Flipkart, Alibaba generates huge amount of logs from which users buying trends can be traced.
Weather Station All the weather station and satellite gives very huge data which are stored and manipulated to forecast weather.
Telecom company elecom giants like Airtel, Vodafone study the user trends and accordingly publish their plans and for this they store the data of its million users.
Share Market Stock exchange across the world generates huge amount of data through its daily transaction.
Velocity The data is increasing at a very fast rate. It is estimated that the volume of data will double in every 2 years.
Variety Now a days data are not stored in rows and column. Data is structured as well as unstructured. Log file, CCTV footage is unstructured data. Data which can be saved in tables are structured data like the transaction data of the bank.
Volume he amount of data which we deal with is of very large size of Peta bytes.
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