THE WEB IS DISTRIBUTED
Web content can take up a great deal of
space, particularly when you include images, audio, and video. To store all of
the information, graphics, and multimedia published on the web, you would need
an untold amount of disk space, and managing it would be almost impossible.
(not that there aren’t people who try.) imagine that you were interested in finding our more information about alpacas
(Peruvian mammals known for their wool), but when you selected a link in your
online encyclopedia, your computer prompted you to insert CD-ROM #456 ALP
through ALR. You could be there for a long time just looking for the right
CD-ROM!
The web succeeds at providing so much
information because that information is distributed globally across millions of
websites, each of which contributes the space for the information it publishes.
These sites reside on one or more computers, referred to as web servers. A web
server is just a computer that listen\s for requests from web browsers and
responds to that request. You, as a consumer of that information, request a
resource from responds to that request. You, as a consumer of that information,
request a resource from the server to view it. you don’t have to install it,
change disks, or do anything other than point your browser at that site.
A website is a location on the web that
publishes some kind of information. When you view a web page, your browser
connects to that website to get that information.
Each website, and each page or bit of
information on that site, has a unique address. This address is called a
uniform resource locator or URL. When people tell you to visit a site at http://www.yahoo.com/, they’ve just given you
a URL. Whenever you use a browser to visit a website, you get there using a
URL. You’ll learn more about URLs later today in “uniform resource locators”.
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