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Last Post by carobee
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A Web Service is programmable application logic accessible via standard Web protocols. One of these Web protocols is the Simple Object Access Protocol (SOAP)

Consumers of a Web Service do not need to know anything about the platform, object model, or programming language used to implement the service; they only need to understand how to send and receive SOAP messages

Actually Web services provides the ability to exchange business logic/components among diverse systems over web.

Assume that you have a requirement of using a business logic, say for example, income tax calculation in a web application and a desktop application.

Assume that web application is developed using Java and the desktop application is developed using WinForms with C#.

In this scenario, you may need to write code for java and C# separately. It increase the efforts and time.

If you implement income tax calculation as a web service and deploy it over web, both java and C# applications can consume the same service.

The web service can be written using a development platform such as C#, Java etc.

The application which consumes a web service need not be written in the same platform. For example, if you create web service using C#, it can be consumed by other applications written using Java, PHP.

Web services are base for software deployment models such as Saas, SOA and cloud computing.

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Nice explanation
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