A content silo is a site architecture model that groups related pages together under a shared theme, with internal links connecting pages within each group and limiting links between unrelated groups. The goal is to concentrate topical relevance signals in one area of the site rather than diluting them across unrelated content.
A silo typically has three levels: a pillar page covering the broad topic, cluster pages covering specific subtopics in depth, and supporting pages covering adjacent questions. Internal links flow from pillar to cluster and between cluster pages. Pages in one silo link sparingly to pages in unrelated silos.
The practical result of a well-built silo is that Google understands which section of your site is the authority on which subject. For a B2B SEO consultant’s site, separate silos for technical SEO, content strategy, and local SEO allow each section to build authority independently. A Canadian MSP client I worked with saw a 340% increase in organic sessions over 14 months after restructuring their site from a flat architecture into defined content silos with consistent internal linking.
