What is RankBrain?
RankBrain is a Google system that uses machine learning to understand what searches mean, especially new or unusual ones.
RankBrain was one of Google's first uses of machine learning in search, announced in 2015. It helps Google understand how words relate to ideas, so it can return good results even when a search uses words that do not appear on the best page. Google now uses several AI systems for this kind of understanding. RankBrain is something Google runs, not something site owners set up or optimize for directly.
Why it matters for your business: It is one reason you no longer need to repeat exact keywords. Writing clearly about your topic in natural language serves search engines and readers alike.
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