Volume refers to the size of the data to be processed.
Volume of Big Data goes far beyond the conventional
limits of megabytes or gigabytes and reaches the terabytes
or even petabyte. Velocity refers not only to frequency of
the data generation but also to the dynamic aspects of the
data as well as the need of generating the results in realtime.
Variety refers to the multimodal nature of data such
as different data schemas of data sources, structured data
like ontologies and unstructured data like sensor signals
[4], [5].