If you searched this forums you would find tons of info on Caffeine, in brief it's the new Google Algorithm.
Caffeine is new experimental algorithm approach by Google to provide more realistic and fast results to the Users.
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Google is launching a new, upgraded version of its search engine soon. They promise that the new search tool (codename “Caffeineâ€) will improve the speed, accuracy, size, and comprehensiveness of Google search. You can find it in many threads here
Caffeine is a new , upgraded version of its search engine by Google to provide more realistic and fast results to the users.