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Basic difference between Application server & Webserver

 
Ramesh Shanmugam
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I want to know the basic difference between Application server(Like Websphere) and the Webserver(Apache Tomcat) server.

can any please tell me in detail why we need Applcation server and Webserver.
 
Mike Curwen
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first: Apache Tomcat is not just a webserver. Many people would in fact call it an application server.

Websphere, iPlanet, SunONE, JBoss -> These things are usually called app servers, and what they really mean is "it does EJB's".

Tomcat is not quite a "full-blown" app server, because it only does servlets/jsps and not EJBs.

a plain old "web server" (like Apache), serves only HTML pages (as long as it doesn't have any modules).
 
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