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While Google can be rather secretive about it's ranking methods, they do share tidbits with us from time to time.  These little pieces of information are then dissected by the Search Engine Optimization (SEO) community, compared to other information as well as performance data, and on and on.  All to try to determine both what Google metrics are used for ranking, and what metrics could be used in the future.  It was recently shared that RankBrain is the third most important ranking signal.  But what is RankBrain?