E-Commerce
Commerce conducted over the Internet. For example, an online publisher may sell a book to a customer, ship it to him/her, receive payment, and conduct the entire matter without ever meeting the customer. E-commerce became common in the 1990s with the popularization of the Internet. E-commerce involves the buying and selling of products or services using an electronic payment processor. It can be either a business-to-business (B2B) or business-to-consumer transaction. Business activities take place on the Internet, or more specifically, the Web.

A virtual storefront is a website that allows a person to research, order, and pay for a product online. For example, a person may visit Amazon to look for a new book. They can read reviews and then purchase the book from that site.

Information broker firm who locates and resells secondary (already published or otherwise available) information, such as articles, citations, competitor data, research data.
A transaction broker (also referred to as a facilitator, coordinator or contract broker) is not a representative or agent for either the buyer or the seller. The job of a transaction broker is to help both the buyer and the seller by bringing them together with the necessary platform provided where products and services are being traded for value. By doing do, the brokers earned commissions each time a sales transaction is made.
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Online marketplace refers to a type of ecommerce site where product and inventory information is provided by multiple third parties, whereas transactions are processed by the marketplace operator. Online marketplaces are the primary type of multichannel ecommerce.In an online marketplace, consumer transactions are processed by the marketplace operator and then delivered and