Introducing Web Services

To implement this kind of mash-up, we’ll first need to understand a little about the technology that makes it possible: Web services. A Web service is the mechanism by which two applications that run on different platforms, that were written in different languages, and that are geographically remote from each other, can exchange data using the Internet. Web services makes data exchange between two such applications as straightforward as the way that two processes can exchange data on a single computer.

The way that data is exchanged between two Web services is similar to the way data is exchanged between a Web browser like Microsoft Internet Explorer and a Web server. Just as a Web browser uses a common network protocol ...

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