E-commerce involves the buying and selling of goods and services over electronic networks. It was first introduced in the 1960s through electronic data interchange and standards for it were developed in the 1970s. In the 1990s, the rise of eBay and Amazon revolutionized the industry by facilitating business-to-consumer and consumer-to-consumer transactions online. The main advantages of e-commerce are convenience, time savings, options, and ease of comparing products and reviews, while disadvantages include potential issues with quality, hidden costs, delays in receiving goods, and needing internet access.