June 20, 2026 · Content Process
What is a content silo? (And when you actually need one)
A content silo is a group of pages on your website that cover a single topic in depth, structured so that Google can understand the relationship between every page in the group.
It is the architecture behind the sites that seem to rank for everything in their niche. Not because they published more content. Because they structured it differently.
How a content silo is structured
Every silo has two components.
The pillar page. A single page that covers a broad topic at a high level. It does not try to cover every subtopic exhaustively. It introduces them, links to the pages that do, and gives Google a clear signal about what this cluster of content is about.
The supporting pages. A set of pages, typically between four and ten, that each cover one subtopic from the pillar in depth. Each supporting page links back to the pillar, and the pillar links out to each supporting page. The internal linking creates a closed loop that reinforces topical relevance across the whole structure.
A simple example: an online shoe retailer building a silo around running shoes.
- Pillar: Running shoes guide (what to look for, types, how to choose)
- Supporters: trail running shoes, road running shoes, marathon running shoes, running shoes for flat feet, running shoes for beginners, how to clean running shoes
Each supporting page ranks for its own specific queries. The pillar page ranks for the broader query. The whole structure signals to Google that this site has genuine authority on the topic of running shoes, which helps all the pages rank better than they would as standalone posts.
How a silo differs from a blog
A blog post is written to stand alone. A silo page is written to be part of a structure. That changes everything about how you plan it.
Blog posts are typically planned one at a time. What should we write about this week? Silos are planned as a complete topic map before any writing starts. What is the full territory of this topic? What does a buyer need to understand at each level? Which queries does each page need to own?
Blog posts tend to drift topically over time. Silos stay focused because every page in the silo is scoped by its position in the structure. We have covered how blog posts, content clusters, and silos compare in more detail if you want a direct side-by-side breakdown.
Blog posts compete with each other when they cover similar topics. Supporting pages in a silo complement each other because each one covers a distinct subtopic that the others do not duplicate.
When a silo makes sense
Silos work best when you are trying to own a topic area, not just rank for individual keywords. If your business depends on ranking for a specific category of queries, a well-built silo is usually faster to rank and more durable than producing a similar number of standalone blog posts.
They work particularly well for:
- Service businesses that want to own their service category in their market
- Ecommerce sites building authority around a product category
- B2B businesses where buyers research extensively before making contact
- Any site trying to recover topical authority after a Google core update
When blog posts are the right choice
Blog posts are still the right format when you want to cover a topic that does not naturally group into a hierarchy, when you are testing what content resonates with your audience before committing to a silo, or when you are producing content for an audience that is already engaged rather than trying to capture search traffic from new visitors.
The Starter package at SEO Sandwich is blog-post format for this reason. It is designed for businesses that want a strong set of posts without the full architecture investment. The Classic and Full Stack packages offer a silo option because at those word counts, the architecture pays off.