This document discusses market segmentation and targeting. It defines market segmentation as dividing a market into distinct groups of customers with distinct needs, characteristics, and behaviors. The key benefits of segmentation are identifying new product opportunities, designing effective marketing programs for groups, and improving resource allocation. However, segmentation risks missing customers that don't fit segments and misjudging target markets. The document outlines traditional and individualized segmentation approaches and criteria for successful segmentation like identifiable segments that are substantial, accessible, and responsive. It also discusses defining segments using demographic, geographic, behavioral, and other descriptors for both consumer and business markets.