Orphan Pages.

Orphan pages are pages on a website that have no internal links pointing to them from other pages on the same site. Because search engine crawlers (and users) discover pages by following links, orphan pages are effectively invisible to Googlebot unless they appear in an XML sitemap or have external backlinks.

How Orphan Pages Occur

Common causes: a page was created and then removed from site navigation without being deleted, a landing page was built for a paid campaign with no organic internal link, a redirect was added to a category page but the old child pages still exist at their original URLs, or a CMS migration left legacy URLs without corresponding navigation entries.

Impact on SEO

Orphan pages that contain valuable content lose PageRank distribution from the internal link graph — they cannot accumulate the link equity needed to rank. Important pages with no internal links may also be crawled infrequently, delaying indexing of updates. Orphan pages that have already been indexed may rank poorly or become stale.

Finding and Fixing Orphan Pages

Identify orphan pages by comparing a full site crawl (Screaming Frog) against the sitemap and then against server logs (pages Googlebot crawled but are not in the crawl). Pages in the sitemap but not discovered by crawl = orphans. Fix by adding contextually relevant internal links from high-authority parent pages, or by consolidating content into existing pages and redirecting the orphan URL.