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Topical authority is a site's demonstrated expertise on a subject area, measured by the breadth and depth of content coverage and the quality of internal linking that connects related content. Google uses topical authority as a proxy for expertise and trustworthiness on a given topic.
Building topical authority requires creating a comprehensive content architecture: a pillar page that covers the topic at a high level, supported by cluster pages that cover sub-topics in depth, all interconnected with strategic internal links. Gaps in coverage represent weaknesses that competitors can exploit.
Topical authority compounds. A site that has been consistently covering "technical SEO" for three years — with deep guides on crawl budget, Core Web Vitals, log file analysis, schema, and hreflang — will outrank a newer site on any given technical SEO keyword even with fewer backlinks to that specific page.
Example
Moz has built topical authority in SEO over 15+ years. Any new article they publish on an SEO topic inherits credibility from their established authority, ranking faster than a similar article on a new domain.
Apply this in practice
Definitions are step one.
Our team implements Topical Authority correctly for clients across 15 active engagements. If you want a technical SEO audit that covers this and 100+ other checkpoints, talk to us.