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What is enterprise service bus(ESB)?

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An enterprise service bus (ESB) is a pattern of middleware that unifies and connects services, applications and resources within a business. Put another way, it is the framework within which the capabilities of a business' applications are made available for reuse by other applications throughout the organization and beyond. The ESB is not a new software product it's a new way of looking at how to integrate applications, coordinate resources and manipulate information. Unlike many previous approaches for connecting distributed applications, for example RPC or distributed objects, the ESB pattern enables the connection of software running in parallel on different platforms, written in different programming languages and using different programming models.

Examples of the enterprise service bus patterns exist today, built using existing integration tools available in theIBM Business Integration portfolio of products. For a business, an ESB can manage connectivity needs by providing standards based application integration with support for Web services, message based transport and mediation (transformation and routing) oriented toward a service based infrastructure (often referred to as a service oriented architecture).

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