What is Google RankBrain? It helps to increase your ranking.

RankBrain is a machine learning (AI) algorithm that Google uses to sort the search results. It also helps Google process and understand search queries.

So: what makes RankBrain different?

Before RankBrain, 100% of Google’s algorithm was hand-coded. 

In short, RankBrain tweaks the algorithm on its own.

Depending on the keyword, RankBrain will increase or decrease the importance of backlinks, content freshness, content length, domain authority etc.

Then, it looks at how Google searchers interact with the new search results. If users like the new algorithm better, it stays. If not, RankBrain rolls back the old algorithm.

For more information go to this link