This document discusses customer journeys and how understanding customer behavior can increase business value. It explains what a customer journey is and provides examples of different types of customer journeys like those who surf but don't buy, surf and buy, or surf intensely. The document also discusses how to measure key metrics like engagement, churn, and purchases at different points in the customer journey. Finally, it presents some techniques like association rules, content-based algorithms, and collaborative filtering that can be used to better understand customer preferences and provide personalized recommendations.