Web services: the Web's next revolution

Web services are a new breed of Web application. They are self-contained, self-describing, modular applications that can be published, located, and invoked across the Web. Web services perform functions, which can be anything from simple requests to complicated business processes.

http://www-106.ibm.com/developerworks/edu/ws-dw-wsbasics-i.html?S_TACT=104AHW04&S_CMP=EDU

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