Domain Authority
Definition
Domain Authority is a third-party metric developed by Moz that predicts, on a scale from 1 to 100, how well a website is likely to rank in search engine results, calculated mainly from the quantity and quality of backlinks pointing to the domain, along with other technical factors.
It is not a metric Google itself uses or publishes; Google has repeatedly said it does not use Domain Authority or any similar third-party score in its ranking systems, though the metric remains a widely used shorthand across the SEO industry for comparing the relative strength of different domains.
A closely related concept is backlinks, the links from other sites that feed most third-party authority scores; a site's Domain Authority tends to grow as it earns more links from reputable, relevant sources over time.
For GEO, a domain's overall authority still matters indirectly: AI systems tend to favor citing sources that appear reputable and well-established, which correlates loosely with the same signals, such as backlink profile and site history, that feed metrics like Domain Authority.
Frequently Asked Questions
Is Domain Authority a Google ranking factor?
No, it is a third-party metric created by Moz. Google has stated it does not use Domain Authority or similar third-party scores directly in its ranking algorithms.
What influences Domain Authority the most?
The number and quality of backlinks pointing to a domain is the primary input, along with other technical and on-page signals Moz's model considers.
Is a higher Domain Authority always better?
A higher score generally correlates with stronger overall ranking potential, but it should be read as a comparative, directional signal rather than a precise or guaranteed predictor of rankings.
Do different tools give different Domain Authority scores?
Yes, competing tools such as Ahrefs' Domain Rating or Semrush's Authority Score use their own methodologies and data, so scores are not directly comparable across tools.
