What Is an Enterprise Service Bus?
An Enterprise Service Bus (ESB) is an architectural pattern and a key enabler in implementing the infrastructure for a service-oriented architecture (SOA). Real-world experience has demonstrated that an ESB is only one of many components required to build a comprehensive service-oriented infrastructure (SOI). The term "ESB" has various interpretations in the market, which have evolved over time; however, the basic challenge it addresses is the same.
Namely, the increasing adoption of SOA and the proliferation of Web services have revealed an ever growing need to provide a managed layer between services and their consumers. There must be support for interaction between heterogeneous services and interfaces that might be mismatched, or that might change over time.
An ESB addresses such integration problems in a way that maximizes the re-use of services and that maintains the flexibility to easily change the solution.
http://msdn.microsoft.com/en-us/biztalk/dd876606.aspx
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