Topic cluster
TOP-ik KLUS-ter
A group of interlinked content pieces organized around a central pillar page, covering a topic from multiple angles.
A topic cluster is a pillar page surrounded by related articles that all link to each other and back to the pillar page. The pillar page covers the broad topic. The cluster articles go deep on specific subtopics.
This model works because it signals to search engines that your site has comprehensive expertise on a topic. A single blog post about 'developer onboarding' competes with every other single blog post. But a pillar page on developer onboarding with 15 cluster articles on specific aspects (first-run experience, documentation design, sample apps, time to first hello world) creates a web of authority that is hard to outrank.
The internal linking is critical. Every cluster article links to the pillar page. The pillar page links to every cluster article. Cluster articles link to each other where relevant. This passes link equity throughout the cluster and helps search engines understand the relationship between the pieces.
Examples
A developer platform builds a topic cluster around API design.
The pillar page covers API design principles comprehensively. Cluster articles cover REST vs. GraphQL, error handling patterns, pagination, rate limiting, authentication, and versioning. Each cluster article links back to the pillar page.
A content team measures cluster performance.
The cluster has 12 articles. Together they rank for 200+ keywords and drive 25,000 monthly organic visits. The pillar page alone accounts for 8,000 visits. Removing any single cluster article would reduce overall traffic because it supports the pillar's authority.
A new cluster article boosts the entire cluster's rankings.
The team publishes a new article on API documentation best practices and links it to the existing API design cluster. Within two months, the pillar page's ranking improves from position 5 to position 3 for its primary keyword.
In practice
Read more on the blog
Frequently asked questions
How many articles should be in a topic cluster?
There is no fixed number. Start with 5-8 articles covering the most important subtopics. Add more over time as you identify gaps. Mature clusters might have 15-25 articles. Quality matters more than quantity.
Do topic clusters still work for SEO?
Yes. Google's algorithms reward topical authority. A site that covers a topic comprehensively and with strong internal linking will outrank a site with a single good article on the same topic, all else being equal.
Related terms
A core topic area that forms the foundation of a content strategy, with multiple related pieces branching from it.
A long, comprehensive page that covers a broad topic and serves as the hub for a topic cluster.
Links between pages on the same website that help users navigate and help search engines understand site structure.
A specific, multi-word search phrase with lower volume but higher intent than broad keywords.
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