the computing definition of an E-commerce website

E-commerce (electronic commerce) is the buying and selling of goods and services, or the transmitting of funds or data, over an electronic network, primarily the internet. These business transactions occur either as business-to-business (B2B), business-to-consumer (B2C), consumer-to-consumer or consumer-to-business.

There are a lot of  ecommerce websites in today world ,but few are more famous like amazon ,ebay ,shopify ,alibaba , and walmart .E-commerce websites are further classified depending on type of business .

for example 
                  amazon website is the site for business to costumer ,amazon mainly provides plateform for seller so they can easily sell product to buyer directly.