Content Silo Structure
A content silo structure is an organising principle that groups website content into thematically distinct clusters ("silos") through navigation, URL hierarchy or deliberate internal linking. Each silo revolves around one core topic and its subpages – a structure that makes it easier for readers to find their way and helps search engines grasp how the pages of a website relate to one another.
In practice
A silo structure usually starts with a pillar page that covers a main topic at overview level and links to more detailed subpages, which in turn link back to the pillar page and to each other. It helps to concentrate internal linking within a topic area so that the thematic grouping stays recognisable for readers. Cross-references between topic areas are expressly allowed and often useful – Google recommends internal linking in general and has no rule about sealing topic areas off from one another. The principle is normally visible in the URL structure, in the form of category and subtopic paths, and in the main navigation. For online shops, blogs or advice sites with many subpages, a clear silo logic helps orient both users and search engines, instead of publishing content side by side with nothing connecting it.