A topic cluster is a group of website pages that cover different parts of the same broad subject and are connected through internal links.
For example, a dental website could have a main page about dental implants, supported by articles covering implant costs, the treatment process, recovery, eligibility and common questions. Each page deals with a particular search while remaining closely connected to the main subject.
The idea is to organise related content in a way that makes sense to both visitors and search engines.
How Does a Topic Cluster Work?
A topic cluster normally has a central page covering the main subject, sometimes called a pillar page. Supporting pages then explore narrower questions or areas within that subject.
These pages link to the central page and, where useful, to each other.
The structure gives someone reading one article an easy way to move to related information. It also gives Google links it can follow between pages covering the same area.
A cluster does not need a fixed number of articles. A small subject might need only a few pages, while a large topic could contain dozens.
Topic Clusters and SEO
Topic clusters can be useful when a subject is too broad to cover properly on one page. Separating it into relevant pages allows each one to focus on a particular question or search.
They can also prevent a website from publishing disconnected articles without any clear relationship between them.
The important part is choosing topics people actually need. Creating ten similar articles simply to make a cluster can lead to repetitive content and pages competing for the same searches.
A useful topic cluster covers distinct parts of a subject, connects them logically and gives each page a clear reason to exist.