Google is the only search engine that is widely used. A survey has shown that the use of this search engine is 3 billion queries per day,90 billion per month or 1.1 trillion searches per year.
Google not only indexes and caches web pages, but also takes "snapshots" of other file types, which include PDF, Word documents, Excel spreadsheets, Flash SWF, plain text files, and so on. Except in the case of text and SWF files, the cached version is a conversion to (X)HTML, allowing those without the corresponding viewer application to read the file.
In Google it has been estimated to run more than one million servers in data centers around the world. It processes over one billion search requests and about 24 petabytes of user-generated data each day.
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