This document discusses big data and its hype and realities. It begins by looking at where the hype around big data originated from, including Google and Yahoo's early work and a 2011 McKinsey report. It then defines big data and common misconceptions. The document explores the sources of big data, such as social media, web logs, network data, M2M sensor data, and transaction data. It outlines examples of internal and external business uses of big data and different business models. However, it also notes privacy remains an issue and that the industry is still learning how to appropriately use big data.