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A Business-to-Business (B2B) Gateway is a part of a business IT architecture that connects internal resources to external ones. In general, a B2B Gateway links up in-house software processes to e-commerce platforms, or platforms featuring collaboration with partners or vendors.
In many cases, a B2B Gateway is deployed at that point where company data enters the cloud. For example, it can connect an intranet managed in-house to various software as a service (SaaS) platforms delivered by vendors. B2B Gateways may utilize standard languages such as extensible markup language (XML), or "commerce XML" to integrate them into a greater service-oriented architecture, which helps to deal with inventory, business partnerships, supply chains and more.