What internal links are
An internal link connects one page of your site to another page of the same site — navigation menus, links inside body text, "related posts" lists, footers. External links point to other sites; internal links stay home.
Why they matter more than most people think
Internal links do three jobs at once:
- Discovery. Google finds new pages primarily by following links from pages it already knows. A page no internal link points to — an orphan page — can sit unindexed indefinitely, no matter how good it is.
- Authority flow. Ranking strength (PageRank, in the original formulation) flows through links. Pages that many of your own pages link to collect more of it. This is why a site's homepage and most-linked resources rank more easily than pages buried five clicks deep.
- Meaning. The clickable words of a link — the anchor text — tell Google what the target page is about. "our cold brew ratio guide" carries information; "click here" carries none.
What good internal linking looks like
- Link from body text, not just menus. In-content links with descriptive anchors are the ones that carry topical meaning.
- Link related pages into clusters. A guide, its subtopics, and its supporting posts should all reference each other — that's how you demonstrate depth on a topic rather than one lucky page.
- Push links toward the pages you want to rank. If a page matters commercially, it should be reachable in a few clicks from the homepage and referenced by your strongest content.
- Vary anchors naturally. Every link to a page using the identical phrase looks mechanical; describe the target the way the sentence wants to.
The audit questions
Two questions expose most internal-linking problems: Can Google reach every page I care about by following links from the homepage? and Do my most important pages receive the most internal links? When the answer to either is no, the fix costs nothing but editing — which is what makes internal links the cheapest meaningful lever in SEO.