How Do Search Engines Work - Web Crawlers

How Do Search Engines Work - Web Crawlers

It is the search engines that finally bring your website to the notice
of the prospective customers. Hence it is better to know how these
search engines actually work and how they present information to the
customer initiating a search.

There are basically two types of search engines. The first is by
robots called crawlers or spiders.

Search Engines use spiders 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 that is run by the search engine
system. Spider visits a web site, read the content on the actual site,
the site's Meta tags and also follow the links that the site connects.
The spider then returns all that information back to a central
depository, where the data is indexed. It will visit each link you
have on your website and index those sites as well. Some spiders will
only index a certain number of pages on your site, so don't create a
site with 500 pages!

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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