What is Topic Cluster?
A pillar page surrounded by interlinked subtopic pages. Clusters make coverage legible to crawlers and readers at once, and internal links bind them into one structure.
Related terms
Pillar Page
The central page of a topic cluster covering the subject broadly and linking to every subtopic. Pillars anchor internal-link flow and usually target the head term.
Topical Authority
The depth and breadth of expertise a site demonstrates on a subject, earned by comprehensively covering a topic and interlinking it rather than publishing scattered pages. Engines reward the site that most completely owns a subject with rankings across many related queries.
Internal Link
A link between pages on the same site, guiding discovery and distributing relevance. Controlled tests show deliberate internal-link changes lifting organic traffic 5–25%, and underlinked priority pages are a standard audit finding.
On-Page SEO
Optimizing individual pages: titles, headings, content depth, internal links, images, and schema. On-page work decides relevance once technical SEO has made the page reachable.
Title Tag
The clickable headline in search results and the strongest on-page relevance signal. Google rewrites most titles, so clarity and completeness beat rigid length rules.
Meta Description
The optional summary that can become the result snippet. Absence is not a penalty and Google rewrites most descriptions, so prioritize valuable pages where controlled wording earns clicks.