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Web server, web application server, application server?

 
Yu Chen
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Can somebody help clarify the above 3 terms?
:roll: I am reading Manning's Study Kit, and it uses Web Application Server and Application Server, and Web Server interchangably.

-yu chen
 
Tong Chen
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1) Web server:

A computer that delivers (serves up) Web pages. Every Web server has an IP address and possibly a domain name. For example, if you enter the URL http://www.pcwebopedia.com/index.html in your browser, this sends a request to the server whose domain name is pcwebopedia.com. The server then fetches the page named index.html and sends it to your browser.
Any computer can be turned into a Web server by installing server software and connecting the machine to the Internet. There are many Web server software applications, including public domain software from NCSA and Apache, and commercial packages from Microsoft, Netscape and others.
2) Application Server:
A program that handles all application operations between users and an organization's backend business applications or databases. Application servers are typically used for complex transaction-based applications. To support high-end needs, an application server has to have built-in redundancy, monitors for high-availability, high-performance distributed application services and support for complex database access.
The application server examples are: FTP Server, Mail Server, News Server, Proxy Server, Telnet Server, etc, etc.
3) Web Application Server:
This is a type of Application Server. Basically, the complicated business transactions are handled here. Web Application Server for J2EE platform, now we have BEA Web Logic, IBM WebSphere, Macromedia JRun, etc, etc.
Hope this helps,
 
Yu Chen
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Thanks much!
-yu chen
SCJP2
 
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