What Is RankBrain Why You Should Care [For Mere Mortals]

RankBrain is an AI (artificial intelligence) system. Not to be confused with Google Brain, although certainly part of it. RankBrain is not an algorithm update in itself either, it is now part of the overall Google search algorithm. Rumours are that it is the third most important signal of over 200 ranking factors. RankBrain marks a significant shift in direction from the Google search team.