This document provides an overview of e-commerce. It defines e-commerce as the use of electronic transmission mediums like telecommunications to engage in the exchange of products and services requiring physical or digital transportation from one location to another. E-commerce also refers to any business-related activity involving transactions of tangible or intangible goods over a computer network. The document then provides a case study on e-commerce in China, noting that while not new, e-commerce has great potential in China and is actively being used. It discusses specific Chinese companies that are selling products online and how e-commerce is changing aspects of people's lives in China.