Big data refers to extremily large and complex sets of data than can not be process by the traditionals data - processing software. The characteristics of the Big Data are known as the four V's.
Volume
The volume means the size of Data that need to be analyzed and process is typically larger than TB and PB.
Example
Credit card transactions within europe
Size of data
Velocity
Example
Twitter messages
Facebook posts
Speed of generation
Variety
The data can come from 3 types sources:Estructured Semi - estructuredUnstructured
Example
CCTV audio and Video files generated at
various locations in a city.
Different sources
Veracity
It has a lot of records and a high percentage of miningful data.
Example
Data from a medical trial
Quality of data