A web service is a technology that entitles you to invoke applications using internet protocols and standards. The technology is called “Web Services” because it integrates services (applications) using Web technologies (the internet and its standards). Service-oriented architecture (SOA), is used to integrate today’s highly heterogeneous environments using an approach that links services together to build complex but manageable solutions. There is a strong trend for companies to integrate existing systems to implement IT support for business processes that covers the entire business cycle. Thus, there is an increasing demand for technologies that support the connecting or sharing of resources and data in a very flexible and standardized manner. Because technologies and implementations vary across companies and even within divisions or departments, unified business processes could be smoothly supported by technology. Integration has been developed only between units that are already aware of each other and that use the same static applications.
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