Internal links do two things: they help Google discover your pages and they transfer authority between pages. Every page on your site has a finite amount of "link equity" to pass on. The more links a page has, the less equity each individual link carries. Strategic internal linking means sending authority to your PVNs (Pages of Value to the Business) rather than wasting it on low-value pages like legal disclaimers or contact forms.
Chapter 2: The Circulatory System of Your Website
Think of your website as a city. The pages are buildings—some skyscrapers, some modest apartments. The internal links are the streets, avenues, and highways that connect them. Googlebot is a delivery driver who travels those streets delivering packages of relevance. If a street doesn't exist or is blocked, the driver never arrives.
I've been in SEO long enough to have built cities with no roads. I've published great content—really great content—and watched it sit in the search results like a ghost town. No visitors. No engagement. No indexation.
The problem wasn't the content. The problem was I never told anyone it existed. Not users. Not Google. I published it and walked away, assuming it would be discovered.
It wasn't.
Two Vital Functions in One Element
Every internal link on your site performs two functions simultaneously. Understanding these functions is the key to understanding why internal linking matters so much.
Function 1: Discoverability and Indexation
Google discovers pages by following links. This is fundamental to how the web works. When you publish a new page, Googlebot needs a path to find it. That path is created by links.
Think about it: Googlebot starts at your home page (or wherever it enters your site). From there, it follows links. If there's no link from any page on your site to your new page, Googlebot has no way to find it. It might eventually discover it through your XML sitemap, but that's like giving someone a map to a city without showing them how to get there from where they are.
I learned this the hard way with a client who had hundreds of product pages that were never indexed. When I audited their site, I found that their product pages had no internal links at all. None. They existed in the database and were listed in the sitemap, but no page on the site pointed to them. It took Googlebot months to discover and index them.
Here's the rule I now live by: every page on your site should receive at least one internal link from another page on your site. Ideally more. But at least one. If it doesn't, you're rolling the dice on indexation.
Function 2: Authority Transfer (Link Equity)
This is where internal linking gets really interesting.
Every page on your site has a certain amount of authority. In the old days, we called this PageRank. Google has confirmed that the concept still exists and still matters, even though they don't show us the numbers anymore.
Here's how it works: when a page links to another page, it transfers some of its authority to the destination. This is called "link equity" or "link juice."
The amount of equity transferred depends on several factors:
- The authority of the linking page. A page with high authority passes more equity than a page with low authority.
- The number of links on the page. Equity is divided among all outgoing links. A page with 50 links passes less equity to each destination than a page with 3 links.
- The relevance of the link. Context matters. A link from a page about SEO to another page about SEO passes more equity than a link from a page about gardening to a page about SEO.
- The position of the link. Links in the main content pass more equity than links in the footer, sidebar, or navigation. This is based on Google's "reasonable surfer model" patent.
Here's where it gets practical: you want your highest-authority pages to link to your most important pages. You don't want them wasting their equity on pages that don't matter.
The Water Analogy
I like to think of authority as water in a pipe system.
Your home page is a reservoir. It usually has the most authority because it receives the most external links. From that reservoir, water flows through pipes (links) to other pages.
If you have too many pipes coming out of the reservoir, the water pressure drops. Each pipe carries less water. If you have pipes going to places that don't matter, you're wasting water. If you have pipes that are blocked or broken, water doesn't flow at all.
The goal of internal linking is to channel your water to the places that need it most. That means prioritizing your PVNs.
What Is a PVN?
PVN stands for Page of Value to the Business. It's any URL that directly contributes to your goals. For an ecommerce site, that might be product pages and category pages. For a SaaS company, it might be pricing pages and demo request pages. For a content site, it might be your best-performing articles or your lead generation pages.
PVNs are the pages that justify the existence of your site. They're why you're in business. They're what you want people to find.
Your PVNs should be the primary recipients of your link equity. If your home page and your most-linked-to articles don't point generously to your PVNs, you're wasting your most valuable asset.
Identifying Your PVNs
Every business is different, but here's a simple framework for identifying your PVNs:
- Revenue drivers. Pages that directly generate revenue or leads.
- Conversion pages. Pages where users take actions that matter to your business.
- Core content. Pages that represent the heart of what you do.
- Competitive differentiators. Pages that set you apart from competitors.
For most sites, PVNs are a small fraction of total pages. Maybe 5-20 pages on a typical site. But they're the pages that matter most.
The Cost of Poor Internal Linking
Let's make this concrete with an example.
Imagine you have a page that gets lots of external links and has high authority. Let's call it Page A. Page A links to 50 other pages on your site. Among those 50 pages are your contact page, your privacy policy, your terms of service, and your most important product page.
Page A passes its authority to all 50 pages equally. That means your product page gets only 1/50th of Page A's authority. The other 49/50ths are wasted on pages that don't matter to your business.
Now imagine that instead of 50 links, Page A had only 3 links. One to your product page, one to a supporting article, and one to another product page. Each of those pages would get 1/3 of Page A's authority instead of 1/50th.
That's the power of strategic linking.
The Discovery Problem
There's another problem with poor internal linking: discovery.
When you publish a new page, Googlebot needs to find it. The faster it finds it, the faster it gets indexed and ranked.
If your new page isn't linked from anywhere on your site, Googlebot might not discover it for weeks or months. I've seen pages take six months to index because they were orphaned.
If your new page is linked from a high-authority, frequently-crawled page, Googlebot will likely discover it within hours.
This is why it's so important to think about internal linking every time you publish. Not just when you're doing a big site redesign.
The User Experience Angle
We've been talking about Googlebot and authority, but internal links matter for users too.
When you link from one page to another, you're telling the user that those two pieces of content are connected. You're inviting them to explore more. You're keeping them on your site instead of sending them back to the search results.
Google knows this. They track bounce rates, time on site, and pages per session. Good internal linking improves all of these metrics.
Every time you write a piece of content, ask yourself: "What other pages on my site would be helpful to someone reading this?" Then link to them. Not ten of them. Not zero of them. The right ones.
A Simple Way to Think About It
Here's my rule of thumb for internal linking:
Every page should link to at least 2-3 other pages that are contextually relevant.
And:
Every page should receive at least 1-2 links from other pages that are contextually relevant.
These are minimums. Many of your most important pages should have more. But if you're meeting these minimums, you're probably doing better than most sites.
We've covered a lot in this chapter. You now understand the two vital functions of internal links, what PVNs are and why they matter, and the cost of getting internal linking wrong.
In the next chapter, we'll get into the technical concepts you need to master: PageRank, link equity, DR, DA, crawl budget, and anchor text. These terms will come up throughout the rest of the book, so it's worth taking the time to understand them thoroughly.