SpamBrain is an AI System developed internally by Google to combat spam on various platforms. The system was designed to combat content that was created specifically to manipulate pages for the purposes of ranking.
SpamBrain was launched in 2018 and has continuously evolved over the years and has helped Google identify hacked sites, gibberish spam, disruptive and malicious content, and has also helped fight link spam, scams, and online harassment.
The SpamBran system also works hard to identify and reduce low-quality content and ranking manipulations from websites that do not follow Google's quality guidelines.