Internal linking, and what it does for machines.

Traditional internal linking was largely about distributing authority and helping crawlers find pages. Both still apply. What is added is that link structure communicates relationships, and relationships are what a system uses to understand what you are authoritative about.

What links communicate to a machine

A cluster of pages linking to a central page, with descriptive anchors, states that these subjects belong together and that the central page is the primary treatment. That is a claim about topical structure, and it is one of the few structural claims you can make explicitly.

Anchor text does real work here. “Click here” communicates nothing; “how answer engines choose sources” communicates the subject of the destination.

Auditing your current links

Start with a crawl of your own site using any SEO crawler and export internal links. Look for three things: important pages with few internal links pointing to them, anchors that say “read more” or “click here”, and pages with no internal links at all (orphans).

For a service business the fix is usually simple. Every service page should be linked from the main service hub and from two or three related articles, with anchors that name the service. Every article should link to the one service page it supports. That structure alone clarifies more than any amount of navigation tweaking.

Practical structure

• Pillar and cluster, genuinely. A substantive central page, supporting pages that each cover one distinct facet, and links in both directions.
• Descriptive anchors. Phrased the way the destination would be described, not as keywords stuffed into a sentence.
• Links inside content, not only in navigation. Contextual links carry more meaning than a footer list.
• Avoid linking everything to everything. A cluster where every page links to every other communicates no structure at all.
• Keep supporting pages genuinely distinct. Overlapping pages compete with each other and muddy the structure they were meant to clarify.

The mistake worth avoiding

Building a cluster where the supporting pages are thin variations on the pillar. This is common when clusters are planned from keyword lists rather than from genuinely different questions, and it produces a group of pages that cannibalise each other while appearing organized.

The test is simple: could each supporting page be read alone by someone who has not read the pillar, and would they learn something the pillar does not cover? If not, it should be a section of the pillar rather than a page.

Breadcrumbs and hub pages

Breadcrumbs are internal links that state hierarchy explicitly: Home, Services, Water Damage Restoration. Mark them up with BreadcrumbList structured data and they give both search engines and assistants a clear picture of where a page sits.

Hub pages do the same job for topics. A hub that introduces a subject, summarizes each supporting page in a sentence or two, and links to them is useful to readers and makes the cluster's structure explicit. A hub that is just a list of links is not; give each link a line of real description.

Linking out, too

Internal linking gets the attention, but outbound links to sources matter as well. Citing the documentation, research or data behind a claim helps readers check it and signals that the page is grounded in something other than opinion. The GEO research from Princeton and collaborators found that content citing sources was more likely to be surfaced in generative answers.

Link to primary sources where they exist: the regulator, the manufacturer, the original study. A link to a blog post summarizing a study is weaker than a link to the study itself.

Frequently asked questions

Does internal linking matter for AI search?

Yes, for slightly different reasons than traditional SEO. Link structure and descriptive anchors communicate topical relationships, which helps a system understand what you treat authoritatively.

How should I structure a content cluster?

A substantive central page, supporting pages each covering one genuinely distinct facet, contextual links in both directions with descriptive anchors, and restraint about linking everything to everything.

When should a cluster page be a section instead?

If it could not be read alone by someone who has not read the pillar, or teaches nothing the pillar does not cover, it is a section. Thin cluster pages cannibalise each other while appearing organized.

How many internal links should a page have?

There is no target number. Link where it helps the reader go deeper, make sure every important page is reachable in a few clicks, and avoid footers or sidebars that link every page to every other.

Do links in navigation menus count?

Yes, but contextual links in body copy with descriptive anchors communicate more about the relationship between pages.