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Domain Authority is one of the most referenced metrics in SEO, yet one of the most misunderstood. It is not a Google metric: Google does not use Domain Authority, Domain Rating, or any third-party score in its ranking algorithm. These scores are approximations built by SEO tools (Moz, Ahrefs, Semrush) to model link authority based on publicly crawlable backlink data.
What these metrics actually measure
Each tool calculates its score differently, but all fundamentally reflect the quantity and quality of inbound links pointing to a domain. DA and DR are logarithmic scales: moving from 50 to 60 requires far more link acquisition than moving from 10 to 20. These scores are relative and fluctuate as the tool’s crawl index evolves.
How to interpret and use these metrics
Domain Authority scores are most useful as competitive benchmarks. If all competitors cluster around DA 40–50, a site at DA 20 will struggle regardless of content quality. Use these scores to prioritize link acquisition efforts, identify link gap opportunities, and qualify prospective link sources.
Domain Authority and LLMs
High-DA domains are generally more frequently cited in LLM training corpora. A site that has earned strong domain authority through legitimate link acquisition tends to also be better represented in LLM knowledge — both phenomena share the same root cause: being widely recognized as a reliable source.
