RankBrain is a system by Google to rank website based on the user's keyword search and user experience. It has an artificial intelligence algorithm that checks the visitor's behaviour in a website for a given keyword search.
If a user searches for something in Google and visits (for example) the first 3 websites but the user likes more the 3rd website, then Google will temporarily increase the ranking of the 3rd website. Google measures how long the user stays on the website, how many pages the user visits, if the user clicks the 'back' button and so on.
Backlinko just a made a long but very interesting post on that. Just google 'Backlinko rankbrain' to find it.
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