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The Madison Avenue Field GuideA field guide to marketing & advertising, by Brandon Mina

GlossaryStrategy & FrameworksMarket Segmentation

Strategy & Frameworks

Market Segmentation

Dividing a market into groups of buyers with shared needs or traits so offers and messages can be tailored; formalized by Wendell Smith in 1956.

By Brandon MinaCEO, BrandPilot AIUpdated November 2026

Short answer

Market segmentation is the practice of dividing a market into groups of buyers with shared needs or traits so that offers and messages can be tailored to them. Wendell Smith formalized the concept in 1956. Segments may be defined by demographics, behavior, needs or attitudes, and they form the basis for targeting and positioning.