This document discusses e-commerce and its various types. E-commerce refers to buying and selling of products or services over electronic systems like the internet. The main types of e-commerce are business-to-business (B2B), business-to-consumer (B2C), business-to-government (B2G), and consumer-to-consumer (C2C). B2B involves businesses selling to other businesses, while B2C involves direct selling from companies to consumers online. B2G allows businesses and government agencies to exchange information and do business online more efficiently. C2C platforms like eBay allow individuals to buy and sell to each other. The document also outlines some benefits and services of e