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In 1996 the idea of connecting as a ranking signal revolutionized search with what now became Google PageRank. RankBrain is a machine learning (AI) algorithm that Google uses to sort search results. It also helps Google process and understands search queries. Evolved this technology to help Google process nearly 15% of queries registered daily that the search engine has yet to see before. RankBrain was brought in October 2015 and has since become the third most important ranking signal.