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3 minute read · Updated 28 August 2026 · Also called siloing, SEO silo

Definition

A silo is a site structure in which pages on one topic 链接 densely among themselves and sparsely — in the strict version, not at all — to pages on other topics. The goal is a clear thematic boundary a search engine cannot mistake.

The idea dates from the early 2000s. Its softer successor, the topic cluster, keeps the grouping and drops the prohibition on linking across.

Physical and virtual silos

A physical silo is expressed in the URL structure: /cameras/lenses/50mm/. The folder hierarchy mirrors the topic hierarchy.

A virtual silo is expressed purely in links, regardless of URLs. Pages are grouped by what links to what, not by where they sit in a folder tree.

The second is what actually matters. Search engines follow links, not slashes — which is also why 点击深度 and URL depth are different things. A tidy folder structure with no internal links between the pages inside it is not a silo; it is a filing cabinet.

Where the strict version breaks

Applied literally, siloing forbids a link between two genuinely related pages because somebody once assigned them to different categories. That is a rule serving the diagram rather than the reader.

Two costs follow. Useful links go unmade, so pages that would help each other never connect. And the structure becomes brittle: every new page needs a category decision before it can be linked at all, which is exactly the friction that causes 孤立页面.

Search engines have also moved on. Topical relevance is inferred from language and context, not only from link boundaries, so the strict separation buys less than it used to.

What to keep from it

The core insight is sound and worth keeping: pages about the same thing should link to each other densely. A page with fifteen inbound links from closely related pages sits in an unmistakable context.

Drop the prohibition. Link across topics wherever a reader would genuinely benefit — the cross-links are rare enough that they do not blur anything, and each one is a link that would otherwise not exist.

Some plugins offer same-category-only linking as a setting. It is a reasonable default for a large, clearly divided site; it is the wrong default for a small one where nearly everything is related to everything.

Where siloing came from

The technique was formalised in the early 2000s, when search engines relied far more heavily on link structure and far less on understanding language. If a system infers a page’s subject mainly from what links to it, then keeping link neighbourhoods thematically pure is a rational strategy.

That assumption has weakened. Modern retrieval reads the text, the surrounding entities and the query context, so a single cross-topic link no longer muddies anything. What survives is the part that was never about the algorithm: pages on one subject genuinely belong near each other, and readers benefit from that as much as crawlers do.

Silo or cluster — which to build

For nearly every site: the cluster. It keeps the grouping, adds an explicit hub, and permits the cross-links that make a site usable.

The strict silo still has a place on large catalogues with genuinely separate product worlds — a retailer selling both industrial fasteners and garden furniture has no reader who wants a link between them. Even there the boundary should be a default rather than a prohibition.

The test is simple: if you find yourself not making a link that would help the reader, because of the diagram, the diagram is wrong.

Same-category linking as a setting

Several internal linking tools offer a restriction that links may only be placed between posts in the same category. It is the silo idea reduced to a checkbox, and whether it helps depends entirely on how the categories were assigned.

On a site where categories reflect real subject boundaries and every post sits in exactly one, it produces tight, sensible groups. On a site where posts carry four categories each because nobody wanted to choose, it produces near-random restrictions — blocking useful links while permitting arbitrary ones.

Before switching it on, look at how many categories the average post belongs to. Above two, fix the taxonomy first.

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