When a query is requested, the web server instantly goes out to look for results
and sorts billions of online documents. Then it makes a decision on the
relevancy of your query to the search results. This sorting process (indexing)
is automated and cannot be manually intervened. And the web server only
relies on the keywords you enter to perform an online query. For the site
owner, the factors that mostly matter to be found are the page content, the number
and the qualities of the sites that are linked to theirs and the relevance of
the site content to the keywords in query.
More precisely, Google gives a close look at how
a query is performed. When a query is requested through your computer,
the web server receives it, first. This query is in turn sent to the index
server. Then the query goes to the document server where actual web documents
are stored as data. This is where right documents are extracted and their
short descriptions are made. Finally, your query is returned with results
through the web server. Amazingly, this whole process only takes less than
half a second.
So why does the ranking of one site change from time
to time? That's simply because search directory's index is constantly updated.
Relative importance of a site to a particular query or its ranking may change
when the index is updated and new sites are added and deleted.
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