This document discusses e-commerce and e-trading. It defines e-trading as buying and selling of products and services online, giving universal access via the internet. It lists advantages like lower costs, better customer service and information sharing. Limitations include security issues, costs of e-commerce, and inefficient consumer search. Payment methods in e-commerce include debit cards, credit cards, smart cards, e-cash/e-wallets. The value chain of e-commerce includes primary activities like marketing and operations, and support activities.