B2B gateway software is integration middleware that supports information exchange between your organization and its ecosystem trading partners, applications and endpoints. BGS consolidates and centralizes data and process integration and interoperability between a company's internal applications and external endpoints, such as business partners, SaaS or ecosystems. The BGS market is a composite market that includes pure-play BGS solutions and BGS that is embedded or combined with other IT solutions (for example, ESB suites that support BGS features as services connected to the ESB suite, integration brokerage services, e-invoicing software and networks, application platform suites, electronic data interchange [EDI] translators, and managed file transfer [MFT] technology).
Gartner defines integration platform as a service (iPaaS) as a vendor-managed cloud service that enables end users to implement integrations between applications, services and data sources, both internal and external to their organization.