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Yandex data for leading search engines in Russia. Yandex is probably the biggest search engine few people have ever heard of. The Russian search engine has surpassed Microsoft's Bing in the world's top search engine rankings, according to Search Engine Watch, which got its data from ComScore.
Wolfram Alpha is a computational search engine (sometimes referred to as an answer engine). The interface looks similar to that of a regular search engine but queries typed into the search box result answers to specific questions rather than listings of websites that may be relevant to the query.