RankBrain is a machine learning (AI) algorithm that Google uses to sort the search results. It also helps Google process and understand search queries.
In 1996 the idea of links as a ranking signal, revolutionized search with what would become Google PageRank.A lot has happened, and a lot of massive shakeups and algorithms have been introduced since then, but arguably none as important as RankBrain.
RankBrain is one of the “hundreds” of signals that go into an algorithm that determines what results appear on a Google search page and where they are ranked, In the few months it has been deployed, RankBrain has become the third-most important signal contributing to the result of a search query (after links and content)
