Wikipedia describes this as -Electronic commerce, commonly known as e-commerce, eCommerce or e-comm, refers to the buying and selling of products or services over electronic systems such as the Internet and other computer networks. However, the term may refer to more than just buying and selling products online. It also includes the entire online process of developing, marketing, selling, delivering, servicing and paying for products and services. The amount of trade conducted electronically has grown extraordinarily with widespread Internet usage.
This encompasses terms Web to Print (W2P) , Purchase to pay (P2P) and Pay to Click (P2C), these are all delivered on the back bone of the eCommerce platform.
While the barrier to entry is low, the functionally and reward demand from the user base is high. The site might sell football tickets and allow only 90 seconds to complete the purchase, which is often too short and reduces sales. The site might only take certain forms of payments, ship to certain countries or even have different prices for trade and retail.