This document provides an overview of key concepts in electronic commerce including definitions, terms, models, and benefits and limitations. It defines business-to-business, business-to-consumer, and business-to-employee electronic commerce. It also discusses electronic commerce terms like pure vs partial electronic commerce and internet vs non-internet commerce. The document outlines various electronic commerce business models and discusses electronic markets and interorganizational information systems. It covers the driving forces behind electronic commerce and benefits to organizations and consumers. The summary concludes with limitations of electronic commerce including technical and non-technical challenges.