Topic clusters are a content structure where a central “pillar” page is supported by multiple related pages that cover subtopics in more detail and link back to the main topic.
Topic clustering is designed to demonstrate comprehensive coverage of a subject by breaking it into logically related subtopics.
The pillar page provides a high-level overview, while supporting pages explore specific aspects, questions, or components of the topic in depth. Internal links between these pages help search engines understand their relationship.
This structure improves clarity for both users and search engines by organising content around themes rather than isolated keywords. When implemented correctly, topic clusters reduce internal competition, improve crawl efficiency, and reinforce topical relevance across the entire cluster.
From an SEO perspective, topic clusters are a practical way to build topical authority. They help search engines recognise that a site meaningfully understands a core topic and makes the site more likely to rank consistently across a range of related keyword searches.