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What is a Web Service?



Def1: Simply a Web Service is a method of communication (REQUEST + RESPONSE) between two electronic devices/machines over a network. Web services are self-contained applications that can run across the Internet on a variety of platforms.
Def2: A web service is a way of calling a function which is inside a software from some other software
Def 3: Web Services is a way to establish communication between software’s which could be running on different machines (different platforms or operating systems), having been developed using different languages e.g. java, .net, c++ etc.

Why we use Web Services?

·         Web Services can implement in a SOA structure
·         Web service is used to communicate 2 machines irrespective of their language support (i.e. machine1 supports Java and machine2 supports Dot Net) – Language Independent
·         It is a platform independent (A cross-platform, cross-language data model, facilitates the development of heterogeneous distributed applications)
·         It provides re-usability of functions/code (Reusing functionality of already developed (old) systems in new software’s)
·         Accessibility of applications through firewalls using Web Protocols(XML/HTTP) for Interoperability
·         It supports ‘Loosely Coupled systems’ (i.e. loose coupling (or loosely coupled) is a type of coupling that describes how multiple computer systems, even those using incompatible technologies, can be joined together for transactions, regardless of hardware, software and other functional components)
 

 
 

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