Silo SEO is a form of website architecture that involves grouping content by topic into self-contained sections of your website. So, what does a silo structure look like? The Argument for SEO Silo StructureA silo structure is good for site owners, website users, and search engines. Content Silos vs. Topic ClustersTopic clusters are an alternative to content silo architecture. Internal Links shows how many internal links pages on your website have.