This document discusses big data and how it presents both challenges and opportunities for businesses. It defines big data as the massive amounts of both structured and unstructured data being created every day through various digital channels. The three key facets of big data are volume, velocity and variety. The document provides examples of how social media, mobile, and cloud computing are contributing to the big data phenomenon. It also outlines some potential applications of big data for marketing functions like customer service, lead generation, product development, and influencer outreach. Finally, it discusses key principles for strategically leveraging big data such as engaging customers across channels and creating usable insights to act upon.