The document discusses how big data can provide opportunities for marketers to gain a competitive advantage through analyzing large amounts of customer data from diverse sources. It outlines how big data can help retain customers, identify new customers, reveal new opportunities, and drive more profitable advertising. However, it also notes challenges in developing infrastructure to manage big data, tying disparate data sources together, and ensuring privacy. It provides recommendations for marketers to utilize big data, such as appointing a chief data scientist and taking small initial steps.