This document discusses the concept of big data and its key characteristics. It introduces Konstantinos Chalkias and the companies he works for, Erybo Inc. and Safemarket Ltd. It then defines big data as large volumes of data in a variety of formats that are created and collected very rapidly. It lists the common "4 Vs" that characterize big data as variety, volume, velocity, and veracity. It also proposes adding more "Vs" to fully capture the complexity of big data.