This document provides an introduction to e-commerce and discusses key concepts. It defines e-commerce and how it differs from e-business. It identifies the unique features of e-commerce technology and their business significance. It also describes the major types of e-commerce like business-to-consumer, business-to-business, and consumer-to-consumer models. Additionally, it discusses the evolution of e-commerce from the first era to the emerging second era and provides examples of companies like Amazon that helped drive the growth of e-commerce.