It is generally heard that when the number of pages hold by the search engines increases, the chances that they cant provide the best results for the customers are high. It means that, as the log with the search engines increases, the best pages obtained in exchange of the queries will be less in number.
The uncertainty involved in the chances of losing the amount of information content missed by a person looking for results are known by the term entropy. The entropy involved in the search performed by search engines is not that high as we imagine. The search engines can well predict the information and the pages which are more relevant to the person who is making the search.
Since most of the search engines gain more information through the personalization, the entropy is decreased even further. This will make the work of search engines even easier while making a query for the word entered by the user. If there is not much information about the interests of the person making search, they will take personal data like the membership of the individual to understand the kind of information he will be looking for. Location information through IP address is also used as a way to reduce the entropy.
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