This chapter defines every key technical term used throughout the book. You'll learn what PageRank really is (and isn't), how link equity flows through your site, what DR and DA actually measure, why crawl budget matters, and how anchor text shapes relevance. No jargon without definition. Every concept is explained with practical examples you can apply immediately.
- PageRank is still real. It's not a public metric anymore, but it's still a ranking signal. Your home page typically has the most PageRank, and it flows through your internal links.
- Link equity is finite. The more outgoing links a page has, the less equity each individual link carries. Fewer, more strategic links are better than many random links.
- DR and DA are useful but imperfect. They're third-party estimates, not Google metrics. Use them for comparison, not as absolute truths.
- Crawl budget matters for large sites. Good internal linking guides Googlebot to what matters. Poor internal linking wastes crawl budget on low-value pages.
- Anchor text is a powerful signal. Descriptive, varied, and contextually relevant anchor text helps Google understand your pages. Generic anchor text is a missed opportunity.
- The reasonable surfer model means placement matters. Links in content pass more authority than links in footers, sidebars, or navigation.
- PVNs should be your priority. Your most important pages should receive the most link equity. If they're not, you're wasting authority.
Chapter 3: Concepts You Need to Master
Before we go any further, we need to make sure we're speaking the same language.
I've been in enough meetings where someone says "PageRank" and half the room thinks it's a relic of the past, the other half thinks it's still the dominant ranking factor, and nobody really knows what's actually happening.
Here's the truth: PageRank is still real. Link equity is still real. Crawl budget is still real. But the way we talk about them is often wrong.
This chapter is about getting the definitions right. Not because definitions matter in themselves, but because if you don't understand the concepts, you can't apply the strategies.
I've organized this chapter as a glossary of terms. But it's not a dry list of definitions. Each concept comes with examples, analogies, and practical implications for your site.
By the end of this chapter, you'll be able to talk about internal linking with precision. More importantly, you'll know exactly how each concept applies to your work.
3.1 PageRank: The Original (and Its Evolution)
PageRank was Google's foundational algorithm, created by Larry Page and Sergey Brin in 1998. It was based on a simple idea: a link from page A to page B is a "vote" of confidence from A toward B. The more votes B receives, and the more important the pages doing the voting, the higher B's PageRank.
The public PageRank green bar disappeared in 2016. But Google has confirmed multiple times that the concept is still a ranking signal internally. The algorithm has evolved, but the core principle remains: links transmit authority.
What PageRank Is:
- A measure of a page's importance based on the quantity and quality of links pointing to it.
- A distribution system: PageRank flows through links from one page to another.
- Still used by Google as a ranking signal.
What PageRank Is Not:
- A publicly visible metric. You can't check it anymore.
- The only ranking signal. It's one of many.
- A measure of content quality. It's a measure of link authority.
The Plumbing Analogy
Imagine a network of pipes. Your home page is a large reservoir of water (authority). Each link is a pipe. If you don't connect pipes from the reservoir to the pages you want to water, those pages dry up. If you put too many pipes from the reservoir to irrelevant gardens (legal pages, cookie policies), you waste the water.
PageRank is the water pressure. It determines how much water flows through each pipe and how far it goes.
Why This Matters for Internal Linking
Your home page usually has the highest PageRank on your site because it receives the most external links. From there, PageRank flows through your internal links to other pages.
If you have a page with high PageRank that links to fifty other pages, each of those pages gets 1/50th of that PageRank. If you have a page with high PageRank that links to three pages, each of those pages gets 1/3rd.
The math is simple: fewer links from high-authority pages equals more authority per destination.
3.2 Link Equity (or "Link Juice")
Link equity is the modern term for the value or authority that a page passes to another page through a link. It's PageRank in practice.
The Factors That Determine Link Equity:
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The authority of the linking page. A page with high authority passes more equity than a page with low authority. This is obvious but worth stating.
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The number of outgoing links on the page. Equity is divided among all outgoing links. More links mean less equity per link.
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The relevance of the link. 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.
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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, which suggests that Google models how a reasonable person would interact with a page.
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The anchor text. Descriptive, relevant anchor text signals to Google what the destination page is about. Generic anchor text like "click here" is a missed opportunity.
A Real-World Example
I worked with a site that had a page with DR 65 (that's high). That page linked to forty-seven other pages. Among those forty-seven were their contact page, their privacy policy, and their most important product page.
The product page was getting 1/47th of that DR 65 page's equity. That's a tiny fraction.
We reduced the outgoing links from that page to eleven. The product page started getting 1/11th of the equity instead of 1/47th. Within sixty days, the product page moved from position 12 to position 4 for its primary keyword.
That's the power of link equity distribution.
3.3 DR (Domain Rating) and DA (Domain Authority)
These are third-party metrics. They're not from Google, but they're extremely useful for comparing the relative strength of domains.
DR (Domain Rating) — Ahrefs' metric. Measures the quantity and quality of backlinks pointing to a domain on a scale of 0 to 100. It's logarithmic: moving from 20 to 30 is easier than moving from 70 to 80.
DA (Domain Authority) — Moz's metric. Similar to DR, but with its own formula that combines backlinks, referring domains, and other signals.
How to Use These Metrics:
- Identify which pages on your site have the highest DR/PA (Page Authority). These are your heavy hitters.
- Make sure your highest-DR pages link to your PVNs.
- Use DR/PA to prioritize which pages to audit first.
A Word of Caution
DR and DA are useful, but they're not gospel. They're estimates based on third-party data. Google uses its own metrics, which we can't see.
Don't obsess over DR and DA. Use them as directional indicators, not as absolute truths.
3.4 Crawl Budget
Crawl budget is the number of URLs Googlebot can crawl on your site in a given period.
For small sites (less than 10,000 URLs), crawl budget is rarely an issue. Googlebot will likely crawl everything worth crawling.
For large sites (ecommerce with tens of thousands of products, media sites with millions of articles), crawl budget matters a lot.
How Internal Linking Affects Crawl Budget:
- Good internal linking guides Googlebot to your most important pages and away from low-value pages.
- Poor internal linking wastes crawl budget on pages that don't matter.
The Concrete Example
I audited a large ecommerce site with 50,000 product pages. Googlebot was spending 70% of its crawl budget on category filter pages and faceted navigation URLs. Product pages were getting crawled once a month at best.
We restructured the internal linking to prioritize product pages and minimize filter pages. We added canonical tags, blocked certain parameters in robots.txt, and added direct links from the home page to top products.
Within three months, product pages were being crawled daily. Organic traffic increased by 34%.
The Takeaway
Crawl budget isn't about technical tricks. It's about priorities. Your internal linking is how you tell Googlebot what matters.
3.5 Anchor Text
Anchor text is the visible, clickable text in a link. It's one of the most powerful signals you have for internal linking.
Why Anchor Text Matters:
Google uses anchor text to understand what the destination page is about. If you link to your SEO audit service with anchor text "our step-by-step SEO audit methodology," Google understands that the destination page is about SEO audits.
If you link with anchor text "click here," Google gets no useful information.
Best Practices for Anchor Text:
- Be descriptive. Tell the reader and Google what they'll find.
- Include keywords naturally. Don't force it, but use relevant terms.
- Vary your anchor text. Don't use the same exact anchor text for every link to a page.
- Avoid generic anchors. "Click here," "learn more," and "this link" are wasted opportunities.
- Context matters. The words around the anchor text also matter.
A Note on Over-Optimization
Using the exact same anchor text for every link to a page is a red flag. It looks unnatural. Google has filters for over-optimization.
Use variations. If your PVN is "enterprise SEO software," alternate with "our enterprise SEO platform," "the SEO software we use," "our flagship SEO product." The goal is to be natural, not robotic.
3.6 The Reasonable Surfer Model
This is a Google patent that suggests that not all links on a page are equal. Google models how a "reasonable person" would interact with a page.
What This Means:
- Links in the main content are more valuable than links in the footer.
- Links that are prominently placed are more valuable than links that are buried.
- Links that are relevant to the surrounding content are more valuable than links that feel out of place.
For Internal Linking:
This means you should put your most important internal links in your content, not your footer or sidebar. If you want a page to receive authority, place links to it in the body of your articles, surrounded by relevant text.
The Specific Example
I had a client who put all their internal links in the footer. "It's cleaner," they said. "It doesn't distract from the content."
But the reasonable surfer model suggests that footer links are less valuable than content links. We moved their key internal links from the footer to the content. Within two months, the destination pages saw a 22% increase in organic traffic.
3.7 PVN (Page of Value to the Business)
I introduced this in Chapter 2, but it's worth repeating.
PVN stands for Page of Value to the Business. It's any URL that directly contributes to your goals.
Examples:
- Product pages (ecommerce)
- Pricing pages (SaaS)
- Service pages (professional services)
- Lead generation pages (any business)
- Subscription pages (media, SaaS)
Why PVNs Matter:
Your PVNs should be the primary recipients of your link equity. If your home page and your highest-authority articles don't point to your PVNs, you're wasting your most valuable asset.
How to Identify Your PVNs:
- Revenue drivers. Pages that directly generate revenue or leads.
- Conversion pages. Pages where users take actions that matter.
- Core content. Pages that represent the heart of what you do.
- Competitive differentiators. Pages that set you apart.
For most sites, PVNs are a small fraction of total pages. Maybe 5-20 pages. But they're the pages that matter most.
3.8 Putting It All Together
These concepts aren't isolated. They work together:
PageRank is the authority. Link equity is how it flows. DR and DA help you measure it. Crawl budget determines how much of your site gets discovered. Anchor text tells search engines what your pages are about. PVNs are where you want it all to go.
When you understand how these concepts interact, you can build internal linking strategies that actually work.
Instead of just linking randomly, you can link with intention.
Instead of wasting crawl budget, you can guide Googlebot to what matters.
Instead of using generic anchor text, you can send clear signals about relevance.
This is the difference between sites that get internal linking and sites that don't. The sites that get it understand the concepts and apply them systematically.
You now have the vocabulary. You understand PageRank, link equity, DR, DA, crawl budget, anchor text, the reasonable surfer model, and PVNs.
These concepts will come up repeatedly throughout the rest of the book. In Chapter 4, we'll explore the three major internal linking strategies and when to use each.
But before you move on, here's your challenge:
Find a page on your site with high DR and at least ten outgoing links. Map where all those links go. How many of them go to PVNs? How many go to low-value pages? What would happen if you reduced the outgoing links to only the most important ones?
Go do that exercise. It'll take ten minutes and it'll tell you more about your link equity distribution than any theory ever could.