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A web application is a database disc.

A web service is a online service, as in Verizon online service,

Or a web site service that you went to own or rent.

Web application:

=====================

server-based application (as above) which may be accessed over the web via HTTP, but is

meant primarily for interaction with other programs. Thus, it will have a clearly-defined API

which consists of providing responses to HTTP GET and POST requests made by a remote application.

Now, this doesn't mean you can't access a web service from your browser, but it means that the

application won't necessarily have a GUI user interface. You will most likely, for example,

receive all results of GET and POST requests as strings of XML, which requires a client-side parser.

So, think of web applications as completed user interfaces, while web services are more intended to

be application components or "libraries" which can be used by other applications. Essentially,

web services are to distributed applications what DLLs or class libraries are to most traditional

compiled applications.

Also, this means that a web service has to have a more organized design that most web applications,

because there won't necessarily be a human at the other end who can figure out through trial and

error what the app does. This is why the whole concept of "web services" has brought a whole new

set of acronyms such as SOAP, UDDI, etc...

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