SEO Glossary · Content & Keywords

What Is Topic Cluster?

A topic cluster is a group of interlinked pages covering one subject in depth: a central pillar page covers the broad topic, and cluster pages target specific subtopics, all linking back to the pillar. This structure builds topical authority.

How topic clusters improve SEO

By covering a topic comprehensively and interlinking the pages, you signal expertise to Google and spread authority across the cluster. The pillar ranks for the broad head term while clusters capture long-tail queries, and internal links pass equity in both directions. This glossary itself is a cluster - many term pages supporting hubs and tools.

Pro tip
Build the cluster around how your audience thinks, not your product menu. Map their questions first, create a page for each, and link them to the pillar.
Key takeaways
A topic cluster is a pillar page plus interlinked subtopic pages.
It signals topical authority to search engines.
The pillar wins the head term; clusters win long-tail queries.
Internal links pass authority across the whole cluster.

Put it into practice with Soro

Understanding topic cluster is one thing - applying it across every page is another. Soro automates SEO content end to end, researching keywords and publishing optimised articles so your site ranks on Google and gets cited by AI. See how Soro works.

Frequently asked questions

What is the difference between a pillar page and a cluster page?

A pillar page broadly covers a whole topic; cluster pages dive deep into specific subtopics and link back to the pillar. Together they form a topic cluster.

How many pages make a topic cluster?

There is no fixed number - one pillar plus enough cluster pages to cover the subtopics your audience searches for. Quality and coverage matter more than count.

Keep learning

Browse the full SEO glossary