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A web service is an application that can be published or located through the internet. They combine the best aspects of component-based development and the Web. They can be reused without concern for how they were implemented. They are accessed using web protocols such as HTTP and XML.
There is a strong impact on the reduction of costs, quality and speed of computer systems, since an XML Web service is an application created to perform data or processing services to other computer applications. It has gone from being a means for publishing information and content, to becoming a platform for the design and development of distributed computer applications.
