Google Index

The index is where the spider collected data is stored. When you perform a search on a major search engine, you are not searching the web, but the cache of the web provided by that search engine (its index).

Search engines organize their content in what is called a “reverse index.” It sorts web documents by words in a language. When you search Google and it displays 1-10 out of 143,000 website it means that there are 143,000 web pages which either have the words in your keyword phrase on them, or have inbound links containing the words in the phrase.

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How Google stores the index
Know how google works can help webmaster to understand how to improved website.