RankBrain represents one of the most intriguing changes in the world of SEO in the last year. Initially introduced in October 2015, it still remains a mystery for most experts. However, due to numerous studies performed since then, we are able to understand some basics features of this machine learning system.
Even though the name may imply otherwise, its priority is to provide more relevant results to searches that are completely new. After initial trials, people from Google realized that this system is actually great when dealing with ambiguous and poorly defined queries as well as natural language.