Velocity (Data in motion).

Velocity in Big data is a concept which deals with the speed of the data coming from various sources. This characteristic is not being limited to the speed of incoming data but also speed at which the data flows. For example the data from the sensor devices would be constantly moving to the database store and this amount won’t be small enough.

 Velocity involves streams of data, structured records creation, and availability for access and delivery. Indeed it is not just the velocity of the incoming data that is the issue: it is possible to stream fast- moving data into bulk storage for later batch processing, for example.

The importance lies in the speed  of the feedback loop, taking data from input through to decision. Thus our traditional systems are not capable enough on performing the analytics on the data which is constantly in motion.