This document discusses e-retailing and various aspects of online retail business models. It describes how e-tailers allow ordering and delivery of goods and services via mail as well as online marketing directly from manufacturers. The document also outlines different types of e-tailers like pure online retailers and click-and-mortar stores that have both online and physical presence. Additionally, it examines how real estate, insurance, and stock trading have moved online and some issues e-tailers face like disintermediation, reintermediation, and channel conflicts.