The document discusses segmentation strategy as a pillar of marketing. It describes identifying market segments and targets by segmenting consumer markets based on various criteria like geography, demography, psychography, and behavior. Effective segmentation criteria should be measurable, substantial, accessible, differentiable, and actionable. The document provides examples of how Hindustan Unilever Ltd segmented consumer markets in India in 2004 by offering different brands that catered to different consumer segments and their needs.