Final answer:
eBay.com represents C2C commerce, where individual consumers sell to other consumers. Amazon.com is a B2C site where a business sells directly to consumers. These models reflect significant shifts in markets due to technology and globalization.
Step-by-step explanation:
Web auctions like eBay.com represent one of three basic types of electronic commerce, which is C2C (consumer-to-consumer) commerce. On the other hand, Amazon.com is one of the most widely used B2C (business-to-consumer) sites. C2C platforms enable individuals to sell goods or services to each other, typically facilitated by a third-party host that brings buyers and sellers together.
Contrastingly, B2C encompasses transactions made between a business and the end consumer, exemplified by Amazon.com, which has revolutionized retail by allowing consumers to purchase an extensive variety of goods delivered directly to them, without traditional brick and mortar presence.