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Service Oriented Architecture, commonly referred to as SOA, is a leading architectural practice followed by organizations to reduce total cost of ownership, ease of maintenance in software development. Many organizations today are looking up to SOA as an architectural solution to provide a robust computing platform to connect to legacy systems. In this architectural paradigm there is focus on exposing software as a service rather than an application , For example, a bank may expose a web service called openaccountNumber() to the outside world for opening an account. This web service can be used anywhere across the globe for opening bank accounts. You need not write separate applications for the same business function