google.com is a search engine, but does not search internet. It looks up the locally stored database and gives the best match to user. where does it get this data?. well, there are search engines called crawlers. 'Web Crawler' is a program which keeps on searching the internet content and stores it in the database(googles web crawler is named as googlebot). Now, when the user types some input to google.com it is not searching in the internet instantly to get results, but will look in its database of already visited sites by crawler(sometimes we see pages listed by google.com which are not available). This is just to clear the misconception on search engine by the beginners.
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