Market segmentation involves dividing a market into distinct subgroups of customers with common needs or characteristics. It allows companies to target specific segments with tailored marketing strategies. Key steps include identifying segmentation bases, developing segment profiles, selecting target segments, and developing positioning and marketing mixes for each segment. Common bases for segmenting consumers include geographic, demographic, psychographic and behavioral factors. Effective segmentation creates segments that are measurable, accessible, substantial and differential in their response to marketing strategies.