In the framework's terms, what does velocity refer to?

1. The framework's definition is as short as it gets: "Velocity refers to the rate of data flow." 2. The body section adds what follows from it: "Velocity is a measure of the rate of data flow", and high-velocity systems "have been described as streaming data". 3. The architectural consequence is that data in motion "must be handled in a very different way than data at rest", tending to resemble event-processing architectures and often being processed in memory without being stored. 4. The size of the dataset is volume, data from multiple repositories, domains or types is variety, and changes within a dataset is variability. All four are defined within a few lines of each other, so the exact wording is the only reliable discriminator. _Source: NIST SP 1500-1r2 "NIST Big Data Interoperability Framework: Volume 1, Definitions" (Oct 2019), p.8 section 2 "Terms and Definitions"_