Topical Authority

The depth and breadth of expertise a site demonstrates on a specific topic, built through comprehensive coverage of a subject.

Topical authority is a modern evolution of how Google evaluates sites. Rather than just counting backlinks, Google increasingly recognises sites that comprehensively cover a topic as authorities on it — similar to how a medical encyclopedia is trusted more than a single medical article. A site that covers every angle of "SEO" (technical, on-page, off-page, local, international) builds more authority than one that has written a single excellent post about it.

Building topical authority involves topic clustering: creating a comprehensive pillar page (broad overview of the topic) and supporting cluster pages (in-depth coverage of subtopics) all linked together. This signals to Google that you have deep expertise across the entire topic space, not just one facet.

Topical authority helps in AI search as well — AI language models weight information sources that comprehensively cover topics. Sites recognised as authorities in their niche are more likely to be cited in AI Overviews and AI-generated answers.