Last updated: 21 August 2026. Originally published November 2022 and rewritten to match Google’s current documentation.
In November 2022, Google published something SEOs had wanted for years: a single page naming the ranking systems it actually uses, and separating them from the ranking updates people usually talk about. That distinction matters. A system runs continuously in the background. An update is a one-time change to a system.
That guide has been quietly revised several times since. A few systems that were listed as live in 2022 have since been folded into core ranking, one was renamed, and one was dropped from the page altogether. Below is the current picture, along with a note on what changed.
Systems Google currently lists as active
These are the systems Google documents as operating today, in alphabetical order.
- BERT: an AI system that reads how combinations of words express meaning and intent, rather than treating a query as loose keywords.
- Crisis information systems: surfaces hotlines and trusted-organisation content for personal crisis queries, and SOS Alerts during natural disasters.
- Deduplication systems: suppresses near-identical results so one page does not appear repeatedly. Also stops a featured snippet from being repeated further down page one.
- Exact match domain system: words in a domain count as one signal among many, but this system stops keyword-stuffed domains from getting outsized credit.
- Freshness systems: the “query deserves freshness” family, which promotes recent content for queries where recency is clearly expected.
- Link analysis systems and PageRank: still explicitly named. PageRank dates to Google’s launch and remains part of core ranking, though how it works has changed enormously.
- Local news systems: identifies and surfaces local news sources through Top stories and Local news.
- MUM: the Multitask Unified Model. Worth stressing: Google says it is not used for general ranking, only for narrow applications.
- Neural matching: matches the concepts behind a query to the concepts on a page.
- Original content systems: aims to rank original reporting above pages that merely cite it.
- Removal-based demotion systems: sites generating a high volume of valid legal or personal-information removal requests get demoted more broadly.
- Passage ranking system: ranks individual sections of a page, so a single strong passage can rank a page that is otherwise about something else.
- RankBrain: connects words to related concepts, so pages can rank without containing the exact search terms.
- Reliable information systems: elevates authoritative sources and shows content advisories when result quality is uncertain.
- Reviews system: rewards reviews with genuine first-hand analysis and original research over thin roundups.
- Site diversity system: generally caps a single site at two listings in the top results. Subdomains usually count as the same site.
- Spam detection systems: including SpamBrain, which handles content and behaviour that breaches Google’s spam policies.
Retired systems
Retired does not mean irrelevant. In every case below, the system was absorbed into core ranking — the behaviour it rewarded or penalised still applies, it simply no longer runs as a separate, separately-announced system.
- Helpful content system: announced in 2022, became part of core ranking in March 2024.
- Hummingbird: a major ranking overhaul from August 2013.
- Panda system: announced 2011 to reward high-quality original content, absorbed into core ranking in 2015.
- Penguin system: announced 2012 to combat link spam, integrated into core ranking in 2016.
What changed since the 2022 version of this guide
If you read the original 2022 guide, four things are worth knowing:
- The helpful content system moved from the active list to the retired list in March 2024. This is the single biggest change. It does not mean helpfulness stopped mattering — it means the signal is now distributed through core ranking rather than applied as a discrete site-wide classifier.
- The product reviews system was renamed the reviews system, reflecting that it now covers reviews of services and businesses, not just products.
- Spam detection systems were added to the documented list.
- The page experience system is no longer listed as a named ranking system. Core Web Vitals still exist and page experience still has its own documentation, but Google stopped presenting it as a discrete ranking system on this page.
What this list does not tell you
Two honest caveats. First, this is a list of the systems Google has chosen to name publicly. It is not the algorithm, and Google has never claimed it is exhaustive.
Second, and more importantly for anyone planning work in 2026: this page predates the shift toward AI-generated answers in search. Google now maintains separate documentation on AI features and on optimising for generative AI experiences. If your traffic has changed shape over the past two years, the explanation is more likely to sit in that documentation than in this list of classical ranking systems.
The practical takeaway has not really moved. Google retires named systems by absorbing them into core ranking, which means the fundamentals — original content, genuine expertise, a site that is fast and usable, links earned rather than built — keep working long after the system that first enforced them stops having a name. If you are starting out, our introduction to SEO for beginners covers those fundamentals in more depth.
Source: A Guide to Google Search Ranking Systems, Google Search Central documentation.
Tabraiz Bukhari is a Digital Marketing Expert & Psychologist. He has experience in different areas of digital marketing from SEO and Google Adwords to Social Media Marketing and Ecommerce Management. He writes about his expertise and knowledge in digital marketing and sometimes about Psychology related topics. Currently, he is doing a job as an SEO Specialist/Team Leader at NewEraOS.