RankBrain / SEO Terms RankBrain RankBrain is a component of Google’s search algorithm that uses machine learning to better understand and process search queries. It helps Google interpret the meaning behind complex or unfamiliar searches and deliver the most relevant results, even when the exact keywords are not used. Introduced in 2015, RankBrain is part of the broader Hummingbird algorithm and plays a key role in determining how search results are ranked. Unlike traditional keyword-matching systems, RankBrain analyses patterns in language and user behaviour to predict which pages are most likely to satisfy a search. For example, if someone searches “best tools for remote collaboration,” RankBrain will evaluate content that not only includes those terms but also provides strong engagement and contextual relevance. It continually refines its understanding based on how users interact with results, including clicks, bounce rates and dwell time. For SEO professionals, understanding RankBrain means focusing less on exact keyword repetition and more on search intent, content quality and user experience. For B2B and SaaS companies, this means crafting helpful, clearly structured content that answers real customer questions. For nonprofits, it supports creating accessible, mission-driven content that connects with audiences based on topic relevance. Optimising for RankBrain involves writing in natural language, covering topics comprehensively and improving overall site performance to meet user needs.