Technical Definition
RankBrain is Google's machine learning component for processing search queries. Announced 2015, helps interpret ambiguous or novel queries. Confirmed top-3 ranking factor. Learns patterns from user behavior to improve results. Cannot be directly optimized for; focus on relevance and user satisfaction. Part of broader move toward ML-driven search.
Simple Explanation (ELI13)
RankBrain is Google's machine learning system that helps figure out what searchers want, especially for unusual or new queries. Google said it's one of the top three ranking factors. You can't really optimize for it directly; just focus on creating content that satisfies what people are looking for.
Related Terms
Machine Learning, Ranking Factors, Query Understanding, AI
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