Silo structure is an approach to site architecture where related content clusters into topical silos, each with its own pillar page and supporting articles that internal-link within the silo. Concentrates topical authority.
Silo structure benefits both SEO (Google sees a coherent topic cluster) and AEO (answer engines can identify what the site knows about). The key is consistent internal linking within each silo and clear pillar pages that anchor the topic.