Is siloing still effective for SEO?

Yes, in its modern form. Rigid, isolated silos are outdated, but the core idea — grouping related content and linking it tightly around a hub — remains how topical authority is built. It's now usually called the pillar–cluster model.

What is the difference between a silo and a topic cluster?

They're nearly the same idea. A silo emphasises strict separation between sections; a topic cluster emphasises a pillar page with supporting articles linking to it. Modern SEO favours the cluster model, which allows relevant cross-linking between topics.

What Is a Silo Structure in SEO? (And When to Use One)

Q: What is a silo structure in SEO?

A way of grouping a website into themed sections, where each section's pages link tightly among themselves and to a central category page. It concentrates topical relevance and internal link authority within each theme.

Siloing is one of the older ideas in SEO structure, and it still gets argued about. Stripped of the dogma, it’s a simple, durable principle: group related content together and link it tightly. Here’s how a silo structure works and when it’s the right model.

What a silo structure is

A silo structure divides a site into themed sections. Within each silo, pages link to one another and up to a central category or hub page, while links across silos are kept minimal. The aim is to make each section an unmistakable, self-contained authority on its topic, so search engines see a concentrated block of relevance rather than scattered pages.

How siloing works

Silos are built two ways, usually together:

Physical silos use the URL and folder structure — /coffee-brewing/pour-over/ keeps related pages under a shared path.
Link silos use internal links — pages within a theme link to each other and to the silo’s hub, concentrating authority around the topic.

Link silos do the heavier SEO work. The folder path helps legibility, but the internal linking is what routes relevance and authority.

Silos vs the pillar–cluster model

The modern version of siloing is the pillar–cluster model: a pillar page covers a topic broadly, supporting cluster articles cover subtopics in depth, and everything links back to the pillar. It’s the same instinct — concentrate topical authority — with one key difference: clusters allow relevant cross-linking between topics, where strict silos forbid it. Today the cluster model is preferred, because cutting genuinely useful cross-links to enforce a silo usually costs more than it gains.

When to use a silo structure

Use tight siloing when you’re building authority across several distinct topics that rarely overlap.
Use the looser cluster model for most sites, where topics relate and cross-links help users.

Either way, the engine is the same — grouping and internal linking around a hub. Siloing is one expression of good site architecture, not a separate trick.

A site architecture audit maps your current topical grouping and internal links, showing where your themes are concentrated, where they leak, and how to tighten them around the right hubs.