This document discusses how to build an application in the field of big data. It notes that collecting data is just the beginning and that big data comes in volumes, velocities, and varieties. Examples are given of sports analytics conferences and how analytics can be used to make sports safer and better understand fans to cater to them. Sports organizations like the Oakland A's and New York Yankees are mentioned to show analytics being used despite budget differences. The document concludes by emphasizing that big data should inform rather than dictate to industries like sports.