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The spider will periodically return to the sites to check for
any information that has changed. The frequency with which this
happens is determined by the moderators of the search engine.
A spider is almost like a book where it contains the table of
contents, the actual content and the links and references for
all the websites it finds during its search, and it may index up
to a million pages a day.
Example: Excite, Lycos, AltaVista and Google.
When you ask a search engine to locate information, it is
actually searching through the index which it has created and
not actually searching the Web. Different search engines produce
different rankings because not every search engine uses the same
algorithm to search through the indices.
One of the things that a search engine algorithm scans for is
the frequency and location of keywords on a web page, but it can
also detect artificial keyword stuffing or spamdexing. Then the
algorithms analyze the way that pages link to other pages in the
Web. By checking how pages link to each other, an engine can both
determine what a page is about, if the keywords of the linked
pages are similar to the keywords on the original page.
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