Software applications written in various programming languages and running on various platforms can use web services to exchange data over computer networks like the Internet in a manner similar to inter-process communication on a single computer.
Web Service is:
•A collection of one or more functions/methods/software resources.
•Packaged as a single entity (encapsulate implementation details).
•Published on the network.
•Available for use by other programs, users and web services over the network.
Examples:
•Microsoft Passport authentication service.
•Stock Quote service.
•Credit checking service to obtain a persons credit information
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