This document provides an introduction and overview of e-commerce. It begins with definitions of e-commerce as the interchange of goods electronically and the history of e-commerce dating back to the 1960s. It then describes the three main types of e-commerce: business to business, business to consumer, and consumer to consumer. Examples of applications of e-commerce include electronic banking, online shopping, and online education. Key aspects for successful e-commerce businesses are also outlined, such as website design, payment gateways, merchant accounts, and shopping carts. Both advantages like 24/7 access and faster transactions, and disadvantages like lack of quality guarantees are discussed. The document concludes by noting the growing scope of e-commerce