This document discusses big data and how it can be used for advertising and marketing purposes. It explains that big data comes from various online sources like social media, search engines, and purchases. It then lists many life events and milestones that companies track to target ads to people during these periods, such as births, marriages, and home purchases. The document promotes using big data to improve SEO, social media, and customer relationship management. It encourages readers to see what specific insights and actions big data vendors are really selling.