Topical Authority.

Topical authority is the measure of how deeply and broadly a website commands a particular subject area. Google increasingly favours sources that treat a topic exhaustively over sites offering a handful of isolated keyword pages. Once a domain is read as an authority for a field, it benefits across the whole breadth of that field — including for queries it never targeted directly. That compounding effect is what makes topical coverage a strategy rather than a series of individual page optimisations.

Authority is built by covering a core topic systematically: one overarching pillar page for the main subject, plus many specific sub-pages, the cluster content, for individual aspects, all sensibly linked to each other. This network signals depth and completeness. The internal links matter as much as the pages themselves, because they tell Google which page is the centre of the topic and how the parts relate to it. A set of twenty unconnected articles is not a cluster; it is twenty articles.

Alongside coverage, E-E-A-T signals count: experience, expertise, authoritativeness and trust. That means named authors with genuine competence, cited sources, visible currency, plus mentions and backlinks from relevant places. Topical authority is not a single trick but the result of consistent, focused work over time. It is also the reason a new domain cannot buy it — the signals it rests on are accumulated, and Google's confidence in a source grows with a track record it can actually observe.

An example: a physiotherapy practice that does not merely publish one 'physiotherapy' page but maintains well-researched articles on back pain, sports injuries, rehabilitation, exercises and prevention — and links them sensibly — is more likely to be read as an authority on the whole subject, and ranks more broadly as a result. The individual pages may be modest performers on their own; the network around them is what lifts the domain. That is why the last article in a cluster often improves the rankings of the first.