Here is an interesting comment from google's own blog…worth reading the posting.
"Some background for those of you who don't build search engines for a living like us: when you search Google, you're not searching the live web. Instead you're searching Google's index of the web which, like the list in the back of a book, helps you pinpoint exactly the information you need. (Here's a good idea of how it all works.)…"
http://www.google.com/howgoogleworks/
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