Service Oriented Architecture (SOA) is a paradigm that defines how two computing entities, such as programs, interact in such a way as to enable one entity to perform a unit of work on behalf of another entity. Summarily SOA is the underlying structure supporting communications between Services.
A Service is defined as a unit of work to be performed on behalf of some computing entity, such as a human user or another program. Service interactions are defined using a description language. Each interaction is self-contained and loosely coupled, so that each interaction is independent of any other interaction.
Simple Object Access Protocol (SOAP)-based Web services are becoming the most common implementation of SOA. However, there are non-Web services implementations of SOA that provide similar benefits. The protocol independence of SOA allows different consumers to communicate with the service in different ways.
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