Business-to-Business (B2B) ecommerce is a type of electronic commerce that involves transactions between two businesses. B2B ecommerce can take many forms, such as electronic data interchange (EDI), online marketplaces, and e-procurement systems. Here are some examples of B2B ecommerce:

1. Electronic Data Interchange (EDI): EDI is a computer-to-computer exchange of business documents, such as purchase orders, invoices, and shipping notices, in a standard format. This type of B2B ecommerce is commonly used by businesses in the manufacturing, automotive, and retail industries.
2. Online Marketplaces: Online marketplaces are platforms that connect buyers and sellers, allowing them to transact without the need for intermediaries. B2B online marketplaces often offer features such as product catalogs, buyer and seller ratings, and order management tools. Examples of B2B online marketplaces include Alibaba, ThomasNet, and Global Sources.
3. E-Procurement Systems: E-procurement systems are software applications that automate the procurement process, from requisition to payment. B2B e-procurement systems often offer features such as vendor management, contract management, and purchase order management. Examples of B2B e-procurement systems include Coupa, Ariba, and SAP SRM.
4. Private Industrial Networks: Private industrial networks are online communities of businesses that collaborate to streamline their supply chain processes. B2B private industrial networks often offer features such as shared inventory management, real-time order tracking, and collaborative forecasting. Examples of B2B private industrial networks include the Automotive Industry Action Group (AIAG) and the Joint Industry Customer Standards (JICS).
5. Direct Selling: Direct selling is a B2B ecommerce model in which a business sells its products or services directly to another business, without intermediaries. This type of B2B ecommerce often involves a sales team that engages with potential customers through phone, email, or in-person meetings.

B2B ecommerce is growing rapidly, as more businesses seek to automate their procurement processes, reduce costs, and improve supply chain efficiency. B2B ecommerce also offers opportunities for businesses to expand their reach into new markets, access a wider range of suppliers and customers, and improve customer satisfaction.