Search Engines display results obtained from a
variety of sources. The source may be a third party search provider
or it could be through the search engine's crawler.
The chart below shows the relationship between
various search engines.
The source may be classified into four types:
Primary provider:
Search Engines rely mainly on the primary provider for their search
results. Some search engines like google do not depend on third
party providers. They display results based on their own algorithm.
Secondary provider: If the primary provider fails to provide the required results,
then the search engines depend on secondary providers for their
results. It is a backup option.
Directory results: Search engines also display results from directories. An open
directory is a volunteer-built guide to the web. It is provided
as an option at many major search engines.
Paid results:
These are also called as sponsered listings. In this type of listing,
the webpage owner pays a fee to the search engine to list their
page.
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