The pillar targets the wide head term and gives a complete overview. Each cluster page handles one narrow question in depth. The internal links in both directions tell search engines these pages belong together and that the pillar is the main entry point for the topic. The structure also helps readers, since someone landing on a specific question can climb up to the overview and someone starting broad can drill down. It is a content organization method, not a technical requirement, and a well structured service section already does much the same job.
A dental practice might build one pillar on implants covering what they are, who qualifies, the stages involved and what affects cost, then cluster pages on bone grafting, single tooth versus full arch, recovery timelines and financing. Each cluster page links back to the pillar, and the pillar links to the booking page. The result is one strong hub instead of a dozen competing half pages, which also prevents keyword cannibalization. Build the pillar first so you know which spokes are actually needed.
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