A cookie is information that a Web site puts on
your hard
disk so that it can remember something about you at a later time. (More technically, it is
information for future use that is stored by the server on the client
side of a client/server
communication.) Typically, a cookie records your preferences when using a particular site. Using
the Web's Hypertext Transfer Protocol (HTTP),
each request for a Web page is independent of all other requests. For this reason, the Web page
server has no memory of what pages it has sent to a user previously or anything about your previous
visits. A cookie is a mechanism that allows the server to store its
own information about a user on the user's own computer. You can view the cookies that have been
stored on your hard disk (although the content stored in each cookie may not make much sense to
you). The location of the cookies depends on the browser. Internet Explorer stores each cookie as a
separate file under a Windows subdirectory. Netscape stores all cookies in a single cookies.txt
fle. Opera
stores them in a single cookies.dat file.
Cookies are commonly used to rotate the banner ads that a site sends so that it doesn't keep
sending the same ad as it sends you a succession of requested pages. They can also be used to
customize pages for you based on your browser type or other information you may have provided the
Web site. Web users must agree to let cookies be saved for them, but, in general, it helps Web
sites to serve users better.
This was last updated in January 2006
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