A central resource introducing a broad topic and connecting readers to related detailed material.
A content pillar, or pillar page, introduces a broad subject and helps readers find more detailed material. It should provide a useful overview in its own right. The reader ought to understand the main questions and choices even before following a supporting link.
The pillar is usually one central page; a topic cluster is the wider set of related pages. A content hub may emphasize browsing and organization more than a continuous explanation. These are practical editorial distinctions, and teams sometimes use the names differently. They are not required Google page types or quality scores.
Choose the pillar’s scope around a real audience need. It does not have to explain every subtopic exhaustively or reach a particular word count. Summarize what belongs in the overview, then link to detailed pages when a reader would benefit from a deeper answer.
Takeaway: Use a pillar when customers need a clear introduction to a substantial subject. Start with existing useful pages before commissioning a large set of new supporting articles.
Example
A commercial cleaning company creates a guide to planning an office cleaning program. It introduces scheduling, scope and access arrangements, then links to separate explanations of floor care and after-hours access. The overview helps a buyer frame the decision without duplicating every operational detail.
What to check
Give each supporting page a distinct job and use descriptive links. Review the overview when services or supporting resources change. Calling a page a pillar does not make it authoritative or guarantee stronger rankings.
For more detail, see Google SEO Starter Guide.