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How Do Search Engines Function - Web Crawlers
It is the search engines that finally bring your website to your potential customer’s
notice. Therefore, it is best to know how these search engines actually work and
how they can present information to the customer who attempts to initiate a search.
There are two basic kinds of search engines. The first is by robots called crawlers
Search Engines use spiders in order to index websites. When you submit
your website pages to a search engine by completing their required submission page,
the search engine spider will index your entire site. A ‘spider’ is an automated
program which is run by the search engine system. A spider visits a web site, reads
the content on the actual site, the site's Meta tags and will also follow the links
that the site connects to. The spider then returns all that information back to
a central depository, where the data is indexed. It will then visit each link you
have on your website and index those sites as well. Some spiders will only index
a given number of pages on your site, so don’t try to create a site with 500 pages!.
The spider will return to the sites periodically in order to check for any information
that might have changed. The frequency with which this occurs is determined by the
search engine moderators.
A spider is almost similar to a book where it contains
the table of contents, the actual content and the links and references for all the
websites that it can find during its search, and it might index up to a million
pages each day.
Example: Excite, Lycos, AltaVista and Google.
When you request from
a search engine to locate some information, it will actually search through the
index which it has created and not actually search the Web. Different search engines
tend to produce different rankings because not every search engine tends to use
the same algorithm to search through the indices.
One of the things that a search
engine algorithm tries to scan 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 will analyze the way that pages link to other pages in the Web. Through
checking how pages link to each other, an engine can both determine what a page
is about, and if the keywords of the linked pages are similar to the keywords on
the original page.
Article Source: http://www.webdesignarticles.net.