le publishes document on more notable ranking systems //

Google has released a new help guide that discusses the most “notable” ranking system Google has used over the years. It also discusses the reasons why they are no longer being used in Google Search. The document is a guide to Google Search ranking system.

Use of ranking systems. These are the current ranking systems at Google Search. Google provides an explanation for each ranking system. These systems may be multiple or single.

• BERT
• Crisis Information systems
• Deduplication systems
• Exact match domain system
• Freshness system
• System of useful content
• PageRank and link analysis systems
• Local news system
• MUM
• Neural matching
• Original content system
• Removal-based demotion system, including legal removals or personal information removals
• Page experience system
• Passage ranking system
• System for product reviews
• RankBrain
• Information systems that are reliable
• Site diversity system
• Spam detection systems

Retired ranking system. These are some of the older ranking systems that have been retired or are being incorporated into newer systems. The page experience system has replaced the outdated page speed system.

• Hummingbird
• Ranking system for mobile-friendly devices
• Page speed system
• Panda system
• Penguin system
• Secure site system

Why we care. This list is extremely useful to determine which ranking systems are still being used and what ones have been discontinued. It is useful to see the Google definitions of each system and how they are used.

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