E-commerce involves buying and selling of goods and services over electronic systems like the Internet. The document discusses the process of e-commerce, which includes a consumer browsing a merchant's website, selecting items to purchase, providing address details, receiving an order confirmation, and the merchant forwarding the order for payment processing and fulfillment. It also covers different types of e-commerce like B2B, B2C, C2C and their examples. Advantages include lower costs, improved access, and around-the-clock shopping for consumers.