First lets take a look at what a soap based web service is. It's easy to get lost in all the technical definitions of web services - so we take a very basic approach. A web service is any server side logic that can be accessed over standard network protocols (HTML, XML, SMTP, etc). So that being the case - web services in general are nothing new. What's new is the SOAP standard. What soap does is standardize the way messages are sent between a Client and a Service. Usually soap messages are sent to a server, which then invoke some application and returns the result. Well their are quite a few more use's but for this tutorial we'll leave it at that. A simple way for any programming language from any server, device, other application, etc - to communicate with any other server, device, application in any programming language.
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