This document discusses how big data analytics is being used in healthcare. It defines big data analytics and how healthcare big data is collected from various sources. Big data analytics allows for prevention of diseases by providing a comprehensive view of patients. It provides examples of how big data helped fight Ebola by tracking population movements and predicting virus spread. Big data can also help address issues during natural disasters by accessing past records. The document outlines some use cases and benefits of big data in healthcare, as well as obstacles to its use.