A store-within-a-store, also referred to as store-in-store (North America) or shop-in-shop (U.K. et al.), refers to a space within a larger retail store, designated for use by a specific brand to feature its products, clearly branded with signs and other branding elements like color, materials, layout, etc. Such a space may be a section of the main area of the store, or it may have the form of an enclosed store with "walls" an entrance, much like a store in a shopping mall.
