The web server simply passes the request to the program to handle it. The web server does not provides any functionality beyond providing an environment in which the server - side program can execute and pass back the generated responses. The server-side program usually provides such functions as transaction processing, database connectivity and messing .
While an application server exposes business logic to client applications through various protocols like HTTP, TCP-IP etc. All the web servers mainly deals with sending HTML for displaying to a Web browser. An application server providers allows the client to access the business logic for use. The application server is used to run business logic or dynamically generating presentation code. A J2EE application server runs servlets and JSPs that are used to create HTML pages dynamically. In this case, J2EE application server can run EJBs ? which are used to execute business logic. An application server is more capable of dynamic behaviour than webserver.
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