The document discusses the significance of big data on public cloud infrastructure, highlighting projections that by 2015, 20% of global 1000 organizations would have focused on information infrastructure. It elaborates on Hadoop and various cloud services like Amazon EMR, Azure, and Google Cloud for big data solutions, emphasizing the importance of scalability, ROI, and governance. A roadmap for implementing cloud-based big data applications is also presented, detailing steps from developing business cases to operationalizing infrastructure.