Internal Linking
Internal linking is the practice of linking one page on a domain to another page on the same domain. Internal links are Googlebot's primary discovery channel, and they distribute authority and relevance signals across the site.
Internal linking is the practice of placing links between pages on the same domain — as opposed to backlinks, which arrive from other sites. For Google, internal links are infrastructure: Googlebot extracts the <a href> URLs from every page it fetches and feeds new ones into its crawl queue, which makes links the primary channel through which crawling discovers content. XML sitemaps are the secondary channel — they list URLs, but carry none of the signals links carry.
Those signals are authority and relevance. Every internal link passes a share of its source page's PageRank — Google's link-authority metric — to the target, so the pages a site links most, from its strongest pages, are the pages Google crawls first and ranks strongest. The link's anchor text acts as a relevance signal, telling Google what the target page is about before it is even fetched.
A page no internal link points to is an orphan page: Google can only find it through a sitemap or direct submission, and it competes for crawling with no inherited authority — the profile of URLs stuck in Discovered – currently not crawled.
Quick facts
How does Googlebot use internal links to discover pages?
Googlebot parses every page it fetches, extracts the URLs in crawlable <a href> anchors, and queues the ones it has not seen — so each internal link is a standing invitation to crawl its target. Links built as JavaScript click handlers, buttons, or onclick events are invisible to this process; Google follows <a> tags with an href attribute.
Depth sets priority. Google crawls outward from strong entry points like the homepage, so URLs a few clicks away get fetched sooner and refetched more often, while deeply buried pages wait at the back of the queue. Flattening the architecture — linking priority pages from the homepage, hub pages, and high-traffic posts — is the structural way to raise crawl priority, and submitting the URL to Google directly is the shortcut when you cannot wait.
Do internal links pass PageRank and anchor text signals?
Yes. Every internal link passes a share of the source page's authority to its target, and its anchor text tells Google what the target is about — the same two signals external backlinks carry, except fully under the site owner's control.
Placement changes weight. Google counts contextual links — placed inside body content, surrounded by relevant text — more heavily than boilerplate navigational links repeated in headers, footers, and sidebars across every page. Anchor text follows the same logic: a descriptive anchor naming the target's topic ("XML sitemap size limits") transfers relevance, while a generic anchor ("click here", "read more") still passes authority but describes nothing.
How do you fix internal linking problems that block indexing?
Three failures account for most link-related indexing problems: orphan pages, excessive depth, and uncrawlable link markup. The audit is a site crawler (Screaming Frog, Sitebulb) crossed with Search Console's Links report and your sitemap inventory.
- Link every indexable URL from at least one indexed, regularly crawled page — sitemap-only discovery leaves pages orphaned
- Lift priority URLs closer to the homepage through hub pages and contextual links from top posts
- Replace JavaScript-only navigation with crawlable
<a href>anchors - Add contextual links from strong pages to URLs sitting in Crawled – currently not indexed — inherited authority is what tips borderline pages over Google's quality threshold
Frequently Asked Questions
How many internal links does a page need to get indexed?+
One crawlable link from an indexed page is enough for discovery. Speed and probability rise with more links from stronger pages, which is why a homepage or hub-page link is the fastest internal route into Google's crawl queue.
Are internal links a ranking factor?+
Yes. Internal links distribute PageRank, and their anchor text feeds relevance. A page's internal link profile shapes how often Googlebot fetches it and which queries Google associates it with.
Do footer and sidebar links count?+
They count for discovery, but Google weights boilerplate links repeated across every page below contextual links placed in body content. Use navigation for structure; use in-content links to push authority at the pages you need indexed and ranking.