1. E-Commerce- The buying  and selling of products and services by businesses and consumers  through an electronic medium without using any paper documents.

2.E-commerce is widely considered the buying and selling of products over the internet, but any transaction that is completed solely through electronic measures can be considered e-commerce.

3.E-commerce is subdivided into three categories:business to business or B2B (Cisco), business to consumer or B2C (Amazon), and consumer to consumer or C2C (eBay). also called electronic commerce.