The Look Book feature is a specially created store page (using a grid layout) that can show a range of images of products styled together (e.g. photos of entire outfits or lifestyle shoots). Etailers can link each of the images directly to the product pages of the multiple items shown, as well as add summary descriptions. This enables customers to shop by style - a great selling tool to appeal to those driven by aesthetics and/or influenced by trends.
This functionality is not available on standalone mobile sites.