Final answer:
The two main categories of e-business are B2B, which is between businesses, and B2C, which is between businesses and consumers. These categories reflect the changes in market definition due to advances in technology and growing globalization.
Step-by-step explanation:
The two primary categories of e-business over the web are B2B (business-to-business) and B2C (business-to-consumer). B2B refers to transactions between businesses, such as a manufacturer purchasing raw materials from a supplier. B2C involves transactions between businesses and individual consumers, like when a consumer buys a book online. These categories have emerged due to significant shifts in technology and globalization, which have increased competition and allowed for a greater connection between buyers and suppliers globally.