Appendix C: Technical Glossary

Appendix C provides definitions for every technical term used in this book. From anchor text to PageRank to crawl budget, all terms are explained in plain language with practical examples. Use this as a reference whenever you encounter unfamiliar terminology in your SEO work.

Anchor text is the visible, clickable words in a link. Example: In the phrase "visit our SEO audit checklist," the anchor text is "SEO audit checklist." Anchor text signals to Google what the destination page is about. Descriptive anchor text is one of the most powerful signals you can send.

Breadcrumbs are a secondary navigation system showing the hierarchical path from the home page to the current page. Example: Home > Blog > SEO > Internal Linking. Breadcrumbs generate structured internal links and help users understand where they are. They also help Google understand your site's structure.

A canonical tag is an HTML element (`rel="canonical"`) that tells search engines which URL is the preferred version when duplicate or similar content exists. Example: `https://example.com/product` is canonical for `https://example.com/product?color=blue`. Canonical tags consolidate authority on one URL.

Crawl budget is the number of URLs Googlebot can crawl on a site in a given period. Influenced by server speed, site popularity, and link structure. For large sites, crawl budget is a critical factor in ensuring important pages get indexed. Good internal linking optimizes crawl budget usage.

Crawl depth is the number of clicks required to reach a page from the home page. A page with crawl depth 1 is directly linked from the home page. A page with crawl depth 5 is five clicks away. PVNs should have a crawl depth of 3 or less.

DA is a third-party metric from Moz (scale 0-100) that predicts a domain's ability to rank based on backlinks and other signals. Useful for comparison but not a Google metric. Higher DA generally indicates stronger ranking potential.

DR is a third-party metric from Ahrefs (scale 0-100) that measures the quantity and quality of backlinks to a domain. It's logarithmic: moving from 20 to 30 is easier than moving from 70 to 80. DR is useful for comparing domain strength.

A follow link is a link without `rel="nofollow"`, `rel="sponsored"`, or `rel="ugc"` attributes. It passes link equity and tells Google to follow the link. Most internal links should be follow links to preserve authority flow.

Indexation is the process by which search engines store a page in their database so it can appear in search results. Pages that are not indexed won't appear in search results. Good internal linking improves indexation speed and coverage.

Link equity (also called link juice) is the value or authority passed from one page to another through a link. Depends on the authority of the linking page, the number of outgoing links, and thematic relevance. Link equity is the practical application of PageRank.

Nofollow is an HTML attribute (`rel="nofollow"`) that tells search engines not to follow a link or pass link equity through it. Google recommends against using nofollow on internal links. Use nofollow for external links you don't want to endorse.

An orphan page is a page that receives no internal links from any other page on the site. Orphan pages may never be discovered by Googlebot. They exist in your database but are disconnected from your linking structure.

Page Authority is a third-party metric from Moz that predicts the ranking ability of an individual page. PA is useful for comparing pages within your site. Higher PA generally indicates stronger ranking potential for that page.

PageRank is Google's original algorithm for measuring page importance based on the quantity and quality of links it receives. Still used as an internal ranking signal. PageRank flows through internal links, making it a critical factor in your linking strategy.

A pillar page is a comprehensive, long-form piece of content that covers a broad topic and acts as a central hub for a topic cluster. It links to cluster articles, and they link back to it. Pillar pages accumulate authority over time.

A PVN is a URL that directly contributes to business goals: sales, leads, subscriptions, or other key conversions. PVNs should be the primary recipients of your link equity. They're the pages that justify the existence of your site.

The reasonable surfer model is a Google patent suggesting that links in different locations on a page (main content, footer, sidebar) have different weights in authority transfer. Links in the main content carry the most weight. This means placement matters for link equity.

SILO is an architecture that groups content into strict thematic sections, minimizing cross-linking between unrelated topics. Helps concentrate relevance signals. SILO prevents authority from leaking to unrelated topics.

A topic cluster is a content structure with a pillar page at the center and multiple cluster articles linked bidirectionally. Builds thematic authority. Topic clusters are one of the most effective internal linking strategies.

An XML sitemap is a file that lists all important URLs on your site to help search engines discover and index them. Useful for finding pages that might not be discovered through links alone. Sitemaps complement internal linking.

Internal links point to other pages on the same domain. External links point to other domains. Internal links are for authority distribution. External links bring authority into your site. Both matter for SEO.

A noindex tag tells search engines not to index a page. It's an HTML meta tag (`<meta name="robots" content="noindex">`). Use noindex for pages you don't want in search results. Don't waste authority on noindexed pages.

A 301 redirect is a permanent redirect from one URL to another. It passes most link equity (90-95%). Use 301 for permanent URL changes. Update internal links directly to avoid redirect chains.

A 302 redirect is a temporary redirect. It may not pass link equity. Use 302 for temporary changes. For permanent changes, use 301. Internal links should always point to the final URL.

A redirect chain is multiple redirects in a row (A→B→C). Each hop causes a small loss of link equity. Avoid redirect chains in internal linking. Update links directly to the final URL.

Link juice is another term for link equity. It's the authority passed from one page to another through a link. The term is informal but widely used. Link juice flows through internal links.

A contextual link is a link placed within the body of content, surrounded by relevant text. Contextual links pass more authority than navigation or footer links. They're the most powerful type of internal link.

A navigation link is a link in menus, sidebars, or footers used for site navigation. Navigation links pass less authority than contextual links. Use navigation for discovery, not authority transfer.

A footer link is a link in the site footer. Footer links pass less authority than content links. Use footers for legal and navigation links, not for authority transfer.

A sidebar link is a link in the site sidebar. Sidebar links pass less authority than content links. Use sidebars for navigation and discovery, not authority transfer.

An image link is a link wrapped around an image. Image links pass authority but lack descriptive anchor text. Use text links alongside image links for better SEO.

A text link is a link with visible text. Text links are the most common and effective type of link. They pass authority and provide descriptive anchor text. Always use text links for authority transfer.

Link authority is the power or weight of a link. High-authority links come from high-authority pages. Link authority determines how much link equity is passed. Focus on links from high-authority pages.

Link velocity is the speed at which you add new internal links. Too fast can look unnatural. Add links consistently over time. Aim for 5-10 new links per week.

Link diversity is the variety of link types and sources. Use a mix of contextual, navigation, and image links. But prioritize contextual links for authority transfer.

Link relevance is how closely the linking page matches the destination page's topic. Highly relevant links pass more authority. Relevance is the most important factor in internal linking.

Link depth is the number of clicks from the home page to a page. Same as crawl depth. PVNs should have shallow link depth (3 clicks or less).

Link density is the number of links on a page relative to the content length. High density can dilute authority. Focus on quality over quantity. Relevance matters more than density.

Link placement is where a link appears on a page. Links in content pass more authority than links in footers or sidebars. Place important links in the content body.

Link prominence is how visible a link is on the page. Prominent links (above the fold, in main content) pass more authority. Prominence matters for link equity transfer.