This document discusses market segmentation, targeting, differentiation, and positioning. It defines market segmentation as dividing a market into groups based on characteristics like geography, demographics, behaviors, etc. Effective segmentation requires groups be measurable, accessible, substantial, differentiable, and actionable. Target marketing involves evaluating segments and selecting strategies like undifferentiated, differentiated, or concentrated marketing. Differentiation positions a product versus competitors based on important attributes. Effective positioning chooses the right competitive advantages and value proposition.