Store formats distinguish types of stores. From a demand perspective, they can be defined as broad, competing store profiles that provide benefits to match the needs of different types of consumers in varied shopping situations. This chapter reviews the competitive role of store formats and their implications for retail marketing strategy. The core challenge for research into store formats is gaining a better understanding of the role of store formats in the competitive structure, including the match between the available portfolio of store formats and the heterogeneity of consumers’ shopping needs and benefits sought. By providing insights into these issues, the chapter can help retailers to configure store format portfolios, manage store formats to deal with changes in the competitive environment, configure a retail marketing plan that is congruent with existing store formats, and manage growth through new store formats or through the adaptation of current formats to new markets.