Professor and Chairman Emeritus, Recreation and Tourism Programme, Purdue University, West Lafayette, Indiana, USA
H.E. Dunsmore
Department of Computer Science, Purdue University, West Lafayette, Indiana, USA
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William Theobald Professor and Chairman Emeritus, Recreation and Tourism Programme, Purdue University, West Lafayette, Indiana, USA H.E. Dunsmore Department of Computer Science, Purdue University, West Lafayette, Indiana, USA |
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There is sometimes some confusion about whether the term "server" refers to software or a computer. Actually, the answer is both! The Web server software at the Cancun Online website may certainly be referred to as Cancun Online's Web server. But, this software is running on the Internet node computer www.cancun.com. (Thus, their website is accessible via http://www.cancun.com). So, in a sense www.cancun.com is the server computer. So, it is perfectly acceptable to refer to the Web server software being run on the Web server computer ... thus, referring to both software and computer as the "server". Context should make it clear which is intended in any instance.
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The World-Wide Web consists of a tremendous amount of hyperlinked multimedia information located all over the world. The obvious question is how does one computer tell another that it wants a certain Web page. This is accomplished by using something called a Uniform Resource Locator (URL). A URL is exactly like an address. It uniquely identifies some Web page, resource, or service. For example, the URL for the Cancun Online website is http://www.cancun.com.
Let us examine this URL. First, the term "http" stands for HyperText Transfer Protocol -- yet another of the many protocols that make the Internet work. Specifically, the HyperText Transfer Protocol (HTTP) is used to send World-Wide Web information from one computer to another. The protocol is usually followed by a colon and two slashes. Next comes the name of the Internet node on which the Web server is running. Thus, there is a computer named www.cancun.com. Recall from the client-server section above that both this computer and the Web software on it may be referred to as Cancun Online's "web server".
Some Interesting Links
A Brief History of the Internet
Uniform Resource Locator: An Explanation
Naming and Addressing: URIs, URLs, ...
Life on the Internet: File Transfer Protocol