How do Search Engines Work?
Most of the top-ranked search engines are crawler based search engines while some may
be based on human compiled directories. The people behind the search engines want the
same thing every webmaster wants - traffic to their site. Since their content is mainly
links to other sites, the thing for them to do is to make their search engine bring up the
most relevant sites to the search query, and to display the best of these results first.
In order to accomplish this, they use a complex set of rules called algorithms. When a
search query is submitted at a search engine, sites are determined to be relevant or not
relevant to the search query according to these algorithms, and then ranked in the order it
calculates from these algorithms to be the best matches first.
Search engines keep their algorithms secret and change them often in order to prevent
webmasters from manipulating their databases and dominating search results. They also
want to provide new sites at the top of the search results on a regular basis rather than
always having the same old sites show up month after month.
An important difference to realize is that search engines and directories are not the same.
Search engines use a spider to "crawl" the web and the web sites they find, as well as
submitted sites. As they crawl the web, they gather the information that is used by their
algorithms in order to rank your site.
Directories rely on submissions from webmasters, with live humans viewing your site to
determine if it will be accepted. If accepted, directories often rank sites in alphanumeric
order, with paid listings sometimes on top. Some search engines also place paid listings at
the top, so it's not always possible to get a ranking in the top three or more places unless
you're willing to pay for it.
Let us now look at a more detailed explanation on how Search Engines work. Crawler
based search engines are primarily composed of three parts.
Most of the top-ranked search engines are crawler based search engines while some may
be based on human compiled directories. The people behind the search engines want the
same thing every webmaster wants - traffic to their site. Since their content is mainly
links to other sites, the thing for them to do is to make their search engine bring up the
most relevant sites to the search query, and to display the best of these results first.
In order to accomplish this, they use a complex set of rules called algorithms. When a
search query is submitted at a search engine, sites are determined to be relevant or not
relevant to the search query according to these algorithms, and then ranked in the order it
calculates from these algorithms to be the best matches first.
Search engines keep their algorithms secret and change them often in order to prevent
webmasters from manipulating their databases and dominating search results. They also
want to provide new sites at the top of the search results on a regular basis rather than
always having the same old sites show up month after month.
An important difference to realize is that search engines and directories are not the same.
Search engines use a spider to "crawl" the web and the web sites they find, as well as
submitted sites. As they crawl the web, they gather the information that is used by their
algorithms in order to rank your site.
Directories rely on submissions from webmasters, with live humans viewing your site to
determine if it will be accepted. If accepted, directories often rank sites in alphanumeric
order, with paid listings sometimes on top. Some search engines also place paid listings at
the top, so it's not always possible to get a ranking in the top three or more places unless
you're willing to pay for it.
Let us now look at a more detailed explanation on how Search Engines work. Crawler
based search engines are primarily composed of three parts.
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