This document discusses customer lifetime value (LTV) and how understanding LTV can help businesses improve customer retention and profitability. It defines LTV as a long-term prediction of future customer value. The document shows how LTV can be segmented at different levels, such as by acquisition channel, device used, or first product purchased, to gain additional insights. Understanding LTV allows a business to prioritize customer retention efforts and target acquisition of new customers similar to existing high-value ones. Machine learning and probabilistic models can help predict factors that influence LTV.