Service refers to any software component that provides functionality and is an independent building block that can be integrated together collectively to
represent an application.
Each service is responsible for its specified role in its own domain. In the business sense the service focuses on a specific business function or possibly a group of functions. This model allows for the creation of isolated units of business functionality that can be easily reused throughout development. The loosely bound services help to provide freedom within the architecture.
In the past service orientation was created using services though increasingly today SOA (Service Oriented Architecture) refers to the use of XML Web services. This is because of the vendor neutral implementation and its interface/implementation provide as an ideal model for SOA.
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