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What is the difference between application server and web server?

I want to know more specific about this. 1.Which of the server support business logic and business logic is written using which programming language? 2.In J2EE,which is application server and which is web server? 3.what are the roles of both the application and web server? 4.Programming language and concept used in application server and web server?

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1. An application server, in an n-tier architecture, is a server that hosts an API to expose business logic and business processes for use by third-party applications.[1] The term can refer to: The services that are made available by the server The computer hardware on which the services are deployed The software framework used to host the services such as JBoss application server or Oracle Application Server The term web server can mean one of two things: A computer program that is responsible for accepting HTTP requests from clients (user agents such as web browsers), and serving them HTTP responses along with optional data contents, which usually are web pages such as HTML documents and linked objects (images, etc.). A computer that runs a computer program as described above. GHOUL
2. i m thinking
3. (1) Webserver serves pages for viewing in web browser, application server provides exposes businness logic for client applications through various protocols (2) Webserver exclusively handles http requests.application server serves bussiness logic to application programs through any number of protocols. (3) Webserver delegation model is fairly simple,when the request comes into the webserver,it simply passes the request to the program best able to handle it(Server side program). It may not support transactions and database connection pooling. (4) Application server is more capable of dynamic behaviour than webserver. We can also configure application server to work as a webserver.Simply applic! ation server is a superset of webserver.