This document compares e-commerce websites and online marketplaces, outlining 10 key differences between the two. It notes that e-commerce requires a larger initial investment as the business owns inventory, while marketplaces have lower costs as sellers manage products. Other differences discussed are the technologies used, scalability, customer relationships, marketing benefits, cash flows, navigation, metrics tracking, and sales volumes. The document then provides advice on choosing a development partner and outlines PixelCrayons' services for building online marketplaces.