This book is useful for IGNOU BCA students. A perusal of past questions papers gives an idea of the type of questions asked, the paper pattern and so on, it is for this benefit, we provide these IGNOU BCS-062: E-Commerce Notes. Students are advised to refer these solutions in conjunction with their reference books. It will help you to improve your exam preparations. This book covers Introduction, Definition, Objectives, Advantages and disadvantages, Forces driving E-Commerce, Traditional commerce Vs. E-Commerce, E-Commerce opportunities for Industries, Growth of E-Commerce. E-Commerce Models: Business to consumer, Business to Business, Consumer to Consumer, other models – Brokerage Model, Aggregator Model, Info-mediary Model, Community Model and value chain Model. Electronic Payment Systems: Special features required in payment systems, Types of Epayment systems, E-Cash, E-cheque, credit card, Smart Card, Electronic Purses. E- Marketing, E-Customer Relationship Management, E-Supply Chain Management. Security Issues in E-Commerce: Security risk of E-Commerce, Types of threats, Security tools and risk management.