Search engines perform several activities to provide search results.
Crawling - Process fetch all web pages related to a website. This
task is performed by software called a robot or a spider (or Googlebot,
in the case of Google).
indexing - index creation process for all web pages and recovered
keep them in a giant database where it can be retrieved later.
Essentially, the indexing process is to identify words and phrases
that best describe the page and assigning the page for keywords.
Treatment - When a search request comes, the search engines process
it, ie, it compares the search string in the search request with the indexed
pages in the database.
Relevance Calculation - It is likely that more than one page contains
search string, so the search begins to calculate the relevance of each
pages in its index to the search string.
Recovery Results - The last step in the activities of search engines is on the upswing
the best results matched. Basically, this is nothing more than just
their display in the browser.
Search engines such as Google and Yahoo often update their relevance algorithm
dozens of times per month. When you see changes in your rankings, it is due to
an algorithmic change or something out of your control.
Although the basic principle of operation of all the search engines is the same, the
minor differences in their relevancy algorithms lead to major changes in
the relevance of results
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