This document defines e-commerce as buying and selling of goods and services over electronic networks like the Internet. It involves buyers, sellers, and producers. Key elements of e-commerce include products/services, marketing, order acceptance systems, payment systems, delivery, returns, and customer support. Types include business-to-business, business-to-consumer, consumer-to-consumer, and consumer-to-business. Issues relate to access, security, trust, and consumer protection. Advantages are convenience and time savings while disadvantages are security, accessibility, and trust. Indian law recognizes e-commerce through the Information Technology Act of 2000.