Topic Cluster
A topic cluster is a group of web pages on one subject: a broad main page, often called a pillar page, and smaller pages that each cover one part of it. HubSpot's guide to the idea describes links from each smaller page back to the main one, and often between the smaller pages too.
Source: HubSpot, Topic clusters: the next evolution of SEO, checked October 29, 2026
What Topic Cluster means for your business
You'll also hear it called a content hub, or the hub and spoke model, with the main page as the hub and the smaller pages as spokes. Google's guides don't use these names, but they do say related things: every page you care about should have a link from at least one other page on your site, and its questions for judging content ask whether your site has a primary purpose or focus.
For a trade business, a cluster is often one service page plus the questions buyers ask about it: what it costs, how long it takes, whether you need a permit. We'd give a question its own page only when people search it as a question of its own. Smaller ones fit as sections on the service page.
If you already have a blog, you don't need to start over. HubSpot's guide pictures a cluster turning a loose archive of posts into an organized set. We'd group the posts that answer questions about one service and link each to that service page. Two posts get a link between them only where a reader of one would want the other, which is HubSpot's advice too. Two posts that answer the same question are better merged into one.
If your blog posts are scattered and none of them point back to the services they're about, planning your pages around what buyers ask is part of our citation-ready content work.
Last reviewed October 29, 2026. All terms
How AI answers it today
On October 29, 2026, Google's AI Overview drew on SEO tool blogs and YouTube and said clusters help with AI answers too. ChatGPT laid out pillar pages, cluster pages and links, compared topic and keyword clusters, and cited nothing.
Our run through ChatGPT and Google's AI Overview, October 29, 2026. A sample, not what every buyer sees.
Related terms in answers and how content gets used
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