Source: https://www.searchenginejournal.com/google-rankbrain-humanizing-seo/162663/
Aside from being an artificial intelligence system designed to process search results and help the core algorithm deliver the best organic results, there’s still little else known about Google’s RankBrain. There is, however, information available on how it can affect SEO.
RankBrain’s impact on SEO
RankBrain is not an algorithm, but it’s a vital component of one. It’s the part of the algorithm that analyzes web page meanings and helps find the most relevant results.
It takes a more interpretive approach to search instead of focusing on exact keyword matches. Higher quality results are found for long-tail or complex search queries.
It gathers information on how people are using search engines. RankBrain harnesses a human-like understanding of web users’ search terms.