This document provides an overview of e-commerce. It discusses that e-commerce involves buying and selling goods and services over the internet. The history of e-commerce is explored, including early electronic fund transfers in the 1970s, electronic data interchange in the 1980s, and the rise of the world wide web in the 1990s. Different types of e-commerce models like business to business, business to consumer, and consumer to consumer are defined. Key statistics on the size of India's e-commerce market and leading companies are presented. Factors for e-commerce success like branding, unique selling propositions, customer retention, and multi-channel marketing are outlined. Risks to e-commerce businesses including search engine optimization,