Quick answer
Internal linking is the practice of connecting pages on the same site with useful, crawlable links. Strong internal architecture helps people navigate and gives crawlers context and discovery paths. NOTABIS reports broken, orphan, weak, and deep-link signals from the links it actually crawls; it does not prescribe a universal link count or menu design.
What the issue means
Useful internal links are placed where the destination helps the reader: a category hub to a product, a guide to a related guide, or a breadcrumb to a parent. Navigation, breadcrumbs, related-content modules, body copy, and sitemaps serve different purposes. A footer full of unrelated keywords is not a substitute for clear information architecture.
Why it matters for SEO
Links help crawlers discover URLs and understand relationships, and they give users routes through a site. Orphan pages have no crawled internal inbound link; weak pages have one; deep pages are more than five measured link levels from the submitted URL. These are review signals, not ranking guarantees. Relevance, visibility, destination quality, and maintainability matter more than a raw count.
How NOTABIS detects it
NOTABIS extracts same-origin anchors from measured HTML, resolves target status, builds an internal-link graph, and recalculates shortest crawl paths after crawling. It can report broken internal links, sitemap-only pages, weak internal linking, and deep crawl pages. Links outside the crawl, private states, and content added after the measured response may be absent.
How to check it yourself
Map important pages from the home page or primary hubs and follow the shortest useful paths. Inspect source HTML and the accessibility tree for link text, redirects, and duplicated URL variants. Compare navigation with your sitemap and analytics, then test broken targets and pages that receive only one inbound link.
How to fix it
Organise content into understandable hubs, add contextual links where the subject is discussed, and use descriptive anchor text. Keep important pages reachable from a small number of meaningful paths, update links after migrations, and link to canonical final URLs. Remove stale links instead of creating irrelevant ones, and preserve keyboard and mobile usability.
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Re-crawl after template, CMS, or routing changes and review the user journey, not just the count.
When this is intentional or does not need fixing
Legal notices, campaign landing pages, feeds, private routes, and one-off downloads may be intentionally isolated. A sitemap can provide discovery without replacing contextual navigation. Do not add links to every page from every footer or sidebar simply to flatten the graph.
Related issues
Compare orphan pages, weak internal linking, deep crawl pages, and broken links versus HTTP errors.
Run a NOTABIS audit
NOTABIS shows the measured internal-link graph, inbound sources, target statuses, and crawl depths so you can improve architecture with evidence.