What is meant by a Link Building Glossary & Terminology

Link building terminology covers the specific terms practitioners use to describe how backlinks get earned, evaluated, and lost, from foundational concepts like anchor text and domain authority to current terms like generative engine optimization. Getting this vocabulary precise matters more than it looks, since sloppy terminology, treating domain authority and domain rating as the same metric, or confusing a manual action with an algorithmic penalty, leads directly to sloppy strategy.

If you have caught a junior team member or a vendor using “toxic backlink” and “spammy link” interchangeably when they mean genuinely different things, or you’re building internal documentation and want definitions precise enough to survive a client asking a follow-up question, here is the complete reference.

What Is Link Building?

Link building is the practice of acquiring hyperlinks from other websites that point back to your own, using tactics ranging from content-driven earning to direct outreach, with the goal of building link equity, referring domain diversity, and topical relevance that search engines factor into rankings. The discipline spans a wide range of techniques and risk levels, from fully compliant white hat SEO to black hat SEO tactics that violate search engine guidelines outright.

Why Understanding Link Building Terminology Matters

Precise terminology prevents real, costly mistakes: confusing a manual action with an algorithmic penalty changes your entire recovery approach, and treating dofollow and nofollow links as interchangeable when reporting results to a client misrepresents what your campaign actually delivered. Industry jargon also shifts meaning over time, generative engine optimization and AI Overviews didn’t exist as working concepts a few years ago, making a current glossary genuinely more useful than one written even two years back.

Miscommunication compounds fastest in agency-client relationships and internal team handoffs, where an SEO specialist’s precise use of a term like link neighborhood gets flattened into vague language by the time it reaches a stakeholder several steps removed from the actual work.

Link Building Glossary: A–Z

Algorithmic Penalty

A ranking drop caused automatically by a Google algorithm update identifying a site’s link profile or content as violating quality guidelines, without any human reviewer directly examining the site. Distinct from a manual action, which involves a human at Google flagging a specific site, an algorithmic penalty affects sites at scale whenever the underlying algorithm runs or updates, meaning recovery often requires waiting for the next relevant algorithm refresh after fixing the underlying issue, not just a reconsideration request.

Anchor Text

The visible, clickable text of a hyperlink, carrying real weight as a relevance signal search engines use to understand what the linked page is about. Anchor text ratio, the mix of branded, exact-match, partial-match, and generic anchors across a site’s backlink profile, matters more than any single anchor choice, since a profile overloaded with exact-match commercial anchors reads as manipulated regardless of the individual links’ quality.

Answer Engine Optimization (AEO)

The practice of structuring content so it gets selected as a direct answer within AI-generated responses, featured snippets, and voice search results, distinct from traditional SEO’s focus on ranking position within a standard results list. AEO overlaps heavily with generative engine optimization but predates the current wave of AI chatbot search tools, originally built around Google’s own featured snippet and voice assistant answer boxes.

Backlinks

A hyperlink from one website to another, functioning as the core unit link building campaigns are built around and one of the most consistently confirmed ranking signals in Google’s own guidance. Also called inbound links from the receiving site’s perspective, the same physical link is an outbound or external link from the linking site’s point of view, a distinction that matters when two teams are discussing the same URL from opposite sides.

Black Hat SEO

Link building and optimization tactics that deliberately violate a search engine’s guidelines to manipulate rankings, including link schemes, private blog networks, and other tactics built around deceiving the algorithm rather than earning genuine authority. The risk isn’t theoretical: Google’s spam policies specifically target these patterns, and detection has improved enough that tactics reliably effective a decade ago now carry real, current penalty risk.

Broken Link Building

A link acquisition tactic built around finding dead links on relevant, external resource pages and pitching your own live content as the replacement, giving the site owner a genuine reason to update their page while you earn a placement. Success rates vary considerably by niche and outreach quality, and this remains one of the more scalable white hat tactics precisely because it offers real value to the linking site rather than asking for a favor with nothing in return.

Citations

An online mention of a business’s name, address, and phone number, which may or may not include a clickable link, valued primarily for local SEO consistency and trust rather than direct link equity. Distinct from a standard backlink, a citation’s core job is verification, confirming the same business details appear consistently across independent sources, which search engines weigh differently than editorial link authority.

Contextual Links

A link placed naturally within the body content of a page, surrounded by genuinely relevant text, generally carrying more weight than a link isolated in a sidebar, footer, or standalone resource list. The surrounding context gives search engines additional relevance signal beyond the anchor text alone, part of why contextual placement is a standard quality benchmark in outreach and guest posting work.

Digital PR

A link building approach built around earning media coverage and editorial links through newsworthy campaigns, original research, or expert commentary, typically targeting journalists and publications rather than individual site owners. Digital PR tends to produce higher-authority links than direct outreach alone, though it usually requires a genuinely compelling story or data asset rather than a generic pitch to work.

Disavow

A Google Search Console tool letting site owners formally tell Google to ignore specific backlinks when evaluating their site, used when toxic or spammy links can’t be removed directly through outreach to the linking site. Disavowing links is a defensive, last-resort measure rather than a routine maintenance task, and Google has repeatedly cautioned against using it preemptively on links that aren’t actually causing harm.

Dofollow Links

The default state of a hyperlink with no rel attribute added, allowing search engines to follow the link and consider it for ranking purposes, as opposed to a nofollow link carrying an attribute that instructs search engines not to pass that signal. Most editorial links earned through genuine outreach are dofollow by default, while paid placements and user-generated content require nofollow, sponsored, or UGC attribution instead.

Domain Authority (DA)

A third-party metric developed by Moz, scored 1 to 100, estimating how likely a domain is to rank in search results based on its backlink profile. DA is not a Google metric and Google doesn’t use it directly in ranking, a distinction worth stating explicitly since DA gets treated as an official ranking factor in careless conversation more often than any other term in this list.

Domain Rating (DR)

Ahrefs’ equivalent metric to Domain Authority, also scored 1 to 100 and based on a domain’s backlink profile, calculated using Ahrefs’ own proprietary formula and index rather than Moz’s. DA and DR often produce different scores for the same domain since each tool crawls and weighs its backlink index differently, meaning comparing a DA score against a DR benchmark, or vice versa, without accounting for this is a common, avoidable analysis mistake.

E-E-A-T

Google’s framework for evaluating Experience, Expertise, Authoritativeness, and Trustworthiness, used as guidance for how content quality raters assess pages, and by extension something link building strategy should reinforce rather than undermine. A backlink profile built on genuine expertise and relevant editorial placements supports E-E-A-T signals, while a profile built on manipulative link schemes works directly against it.

Editorial Links

A backlink earned because the linking site’s editor or author genuinely chose to include it based on the content’s merit, without payment or a direct exchange involved, representing the gold standard of white hat link acquisition. Editorial links carry the strongest trust signal precisely because they can’t be manufactured at scale the way a paid or reciprocal link can.

External Links

A hyperlink pointing from your page to a different domain, the counterpart to an internal link that stays within your own site. Google has stated outbound links don’t pass a direct ranking benefit the way inbound links do, though relevant, well-placed external links still support content quality and topical context signals search engines do evaluate.

Footer Links

A link placed in a website’s footer, appearing sitewide across every page using that template rather than in the body content of one specific page. Footer links carry meaningfully less individual weight than a contextual link, and Google’s guidelines treat commercial footer links, paid partner logos especially, as requiring the same sponsored attribution any other paid placement needs.

Generative Engine Optimization (GEO)

The practice of optimizing content so it gets cited or referenced within AI-generated answers from tools like ChatGPT, Perplexity, and Google’s AI Overviews, a distinct but related discipline to traditional SEO. GEO rewards many of the same underlying signals classic link building already does, genuine authority, clear factual content, real citations, while also introducing new considerations like structured data and content formatted for direct extraction by a language model.

Google Penguin

The Google algorithm update, first launched in 2012, specifically targeting manipulative link schemes and spammy backlink profiles, later folded into Google’s core algorithm as a continuous, real-time signal rather than a periodic update. Penguin fundamentally changed link building practice by making low-quality, manipulative link acquisition a genuine ranking liability rather than a free way to inflate authority.

Guest Posting

Writing and publishing content on another website in exchange for a byline and typically a contextual link back to your own site, one of the most common white hat link building tactics still in active use. Quality varies enormously by execution, a genuinely valuable, well-targeted guest post on a relevant site differs enormously from a templated pitch sent at scale to sites with no real topical connection to the content offered.

HARO

Help a Reporter Out, a platform connecting journalists seeking expert sources with people willing to provide commentary, historically used by SEO professionals as a link building channel since a journalist’s resulting article often includes a link back to the source’s site. The category has evolved beyond the original platform itself, with similar journalist-source connection services filling the same practical role in current digital PR workflows.

Internal Links

A hyperlink connecting two pages on the same domain, distributing PageRank and topical authority across a site’s own structure rather than pointing outward to another domain. Strong internal linking helps search engines understand site architecture and can lift underperforming pages by connecting them to already-authoritative ones within the same site.

Link Building

See the definition at the top of this glossary. Referenced repeatedly throughout this list since nearly every other term here describes a specific mechanism, metric, or risk within the broader discipline.

Link Equity

The value or authority a hyperlink passes from the linking page to the linked page, sometimes still called link juice in older or more casual industry conversation. Link equity isn’t distributed equally across every link, a page’s own authority, the number of other links on that page, and whether the link carries a nofollow attribute all affect how much equity actually transfers.

Link Farm

A network of websites created purely to link to each other or to a target site at scale, with no genuine content value, built explicitly to manipulate rankings rather than serve real readers. Link farms represent one of the clearest, most confidently penalized black hat patterns, and Google’s detection systems have specifically targeted this exact structure for years.

Link Neighborhood

The broader network of sites connected through linking relationships surrounding a given domain, used by tools like Majestic to assess whether a site’s backlink profile sits among genuinely reputable domains or among spammy, low-quality ones. A domain can have a reasonable individual metric score while still sitting in a polluted link neighborhood, a distinction worth checking directly rather than trusting a single authority score in isolation.

Link Profile

The complete collection of backlinks pointing to a website, evaluated as a whole rather than link by link, factoring in referring domain diversity, anchor text distribution, link velocity, and the overall ratio of high-quality to lower-quality sources. A healthy link profile looks naturally varied, accumulated over time from multiple tactics and source types, rather than concentrated in one pattern that reads as manufactured.

Link Reclamation

The practice of finding existing unlinked mentions of your brand or content across the web and reaching out to request a link be added, converting an already-existing reference into an actual backlink. This is generally lower effort than earning a brand-new placement from scratch, since the site has already demonstrated willingness to reference you, they simply didn’t link the mention originally.

Link Schemes

Any pattern of link exchange, purchase, or automated generation designed specifically to manipulate PageRank or rankings, explicitly called out in Google’s spam policies as a violation regardless of whether the mechanism looks sophisticated or crude. Reciprocal link exchanges at scale, paid links without proper disclosure, and automated link-generation programs all fall under this category.

Link Velocity

The rate at which a site acquires new backlinks over time, worth monitoring since a sudden, unnatural spike in link velocity can read as a manipulation signal even when the individual links themselves are legitimate. Steady, consistent link acquisition over time generally looks more natural to search engines than a burst campaign followed by long periods of no activity.

Linkable Assets

A piece of content specifically created to be genuinely link-worthy, original research, an interactive tool, a comprehensive resource, designed to earn backlinks passively through its own merit rather than requiring aggressive outreach to justify a link. Building strong linkable assets makes every subsequent outreach campaign easier, since the pitch becomes “here’s something genuinely useful” rather than “please link to us.”

LLM Optimization

A closely related term to generative engine optimization, referring specifically to structuring content so large language models can accurately parse, understand, and cite it when generating a response. The overlap with GEO is substantial enough that the two terms are often used interchangeably in current industry conversation, though LLM optimization sometimes refers more narrowly to the technical content structure itself rather than the broader visibility strategy.

Manual Action

A ranking penalty applied by a human reviewer at Google after identifying a specific site violating spam policies, distinct from an algorithmic penalty triggered automatically at scale. A manual action shows up directly in Google Search Console with a specific reason listed, and recovery requires fixing the underlying issue and submitting a reconsideration request, a process algorithmic penalties don’t offer.

NAP

Name, Address, and Phone number, the core business information that needs to stay identical in format across every citation and directory listing for local SEO consistency to function correctly. Inconsistent NAP data, an abbreviation mismatch, an outdated phone number still live somewhere, undermines the trust signal citations are meant to build.

Nofollow Links

A link carrying a rel=”nofollow” attribute instructing search engines not to pass ranking signal to the destination page, originally built to combat comment spam and now also required for paid and untrusted placements. A healthy link profile includes a genuine mix of nofollow and dofollow links, since a profile that’s entirely dofollow can itself look unnatural or manipulated.

PageRank

Google’s original link-analysis algorithm, developed by Larry Page and Sergey Brin, evaluating a page’s importance based on the quantity and quality of links pointing to it. While the original public PageRank toolbar was discontinued years ago and Google no longer publishes a visible score, the underlying concept still informs how link equity is understood and discussed across the industry today.

Private Blog Networks (PBNs)

A network of websites, often built on expired domains with pre-existing authority, controlled by a single owner and used specifically to link to a target site while disguising the connection as independent, editorial linking. PBNs sit firmly in black hat territory, and Google has specifically targeted this pattern for years, with detected networks facing manual action across every site involved, not just the target benefiting from the links.

Reciprocal Links

A link exchange arrangement where two sites agree to link to each other, historically common but now explicitly flagged in Google’s link scheme guidelines when done at scale or purely for ranking manipulation rather than genuine mutual relevance. Occasional, genuinely relevant reciprocal linking between naturally connected sites isn’t inherently a violation, but a systematic reciprocal exchange program is exactly the pattern Google’s guidelines target directly.

Referring Domains

The count of unique domains linking to a website, a more meaningful diversity metric than raw backlink count since ten links from one domain carry less value and less natural-looking diversity than ten links from ten separate domains. Referring domain growth is one of the clearest, most commonly tracked success metrics in a link building campaign specifically because it reflects genuine breadth rather than volume from a single source.

Second-Tier Links

A backlink pointing to a page that itself links to your site, rather than pointing directly at your domain, used to strengthen the authority of an existing first-tier link rather than create a new direct one. This tactic carries more risk and less predictable value than direct link building, and current practitioners generally treat it as a minor, situational tactic rather than a core strategy.

Sitewide Links

A link appearing on every page of a website using a shared template, most commonly in a footer, sidebar, or navigation element, rather than placed within one specific page’s body content. Sitewide links, particularly commercial ones, draw more scrutiny from Google specifically because their volume across every page of a site makes an unattributed paid link far more visible than a single instance would be.

Skyscraper Technique

A link building method popularized by Brian Dean of Backlinko, involving finding content that already earns significant backlinks, creating something demonstrably better, then pitching the sites linking to the original to switch their reference. The technique still works as a framework, though the definition of “better” has shifted from pure length and comprehensiveness toward genuine differentiation and original value as competing content has become more saturated.

Toxic Backlinks

A backlink from a source Google’s algorithms or a manual reviewer would consider spammy, low-quality, or manipulative enough to actively harm a site’s rankings rather than simply providing no benefit. Not every low-authority link is toxic, and treating ordinary low-DR links as toxic by default leads to unnecessary, sometimes harmful disavow requests targeting links that were never actually causing damage.

Trust Flow and Citation Flow

Two proprietary metrics from Majestic, each scored 0 to 100: Trust Flow estimates a URL’s trustworthiness based on its link distance from a set of manually verified, highly authoritative seed sites, while Citation Flow estimates influence based purely on the volume and network structure of incoming links regardless of quality. The ratio between the two is the practically useful diagnostic, a site with high Citation Flow but low Trust Flow signals a link profile inflated by low-quality volume rather than genuine authority.

Unlinked Mentions

An existing reference to your brand, product, or content on another site that doesn’t include a hyperlink, representing a genuine, low-effort link reclamation opportunity since the site has already demonstrated willingness to mention you. Monitoring for unlinked mentions and converting them into actual links is one of the more efficient tactics in an ongoing link building program, since the outreach ask is small and the existing relationship context makes a positive response more likely.

White Hat SEO

Link building and optimization tactics that fully comply with search engine guidelines, built around earning genuine authority through quality content, real outreach, and legitimate relationship-building rather than manipulation. White hat tactics generally take longer to show results than black hat shortcuts, but they don’t carry the same penalty risk that can erase months of progress in a single algorithm update or manual action.

Common Link Building Acronyms Cheat Sheet

Acronym	Full Term	Quick Note
DA	Domain Authority	Moz’s metric, not used by Google directly
DR	Domain Rating	Ahrefs’ equivalent to DA, different scoring model
TF	Trust Flow	Majestic’s trust metric, based on seed-site distance
CF	Citation Flow	Majestic’s volume metric, based on link network size
NAP	Name, Address, Phone	Core local SEO consistency data
HARO	Help a Reporter Out	Journalist-source connection platform
PBN	Private Blog Network	Black hat link network, high penalty risk
E-E-A-T	Experience, Expertise, Authoritativeness, Trustworthiness	Google’s content quality framework
GEO	Generative Engine Optimization	Optimizing for AI-generated answers
AEO	Answer Engine Optimization	Optimizing for direct-answer results and snippets

Modern & AI-Era Link Building Terms

Generative engine optimization and answer engine optimization have moved from speculative concepts to genuinely current, practiced disciplines, both rewarding many of the same underlying signals classic link building already values, real authority, clear factual content, genuine citations, while adding new considerations specific to how AI systems parse and select sources. AI Overviews, Google’s AI-generated summaries appearing above traditional organic results, pull from a retrieved set of sources using a combination of semantic relevance and authority signals, meaning a page’s traditional backlink profile still matters even as the display format changes.

Unlinked mentions carry new, current weight in this context specifically, since AI systems building a picture of brand authority and topical relevance can factor in a mention even without a clickable link attached, a genuine shift from the strictly link-equity-focused evaluation classic SEO relied on. LLM optimization and content structured for direct extraction, clear headings, declarative statements, well-organized factual claims, increasingly determine whether a page gets cited in a generative answer at all, regardless of how strong its traditional backlink profile looks on paper.

Black Hat vs. White Hat Terms to Know

White Hat Term	What It Means		Typical Timeline
Guest Posting	Publishing content elsewhere for a byline and contextual link		Weeks to months for meaningful volume
Digital PR	Earning media coverage through newsworthy campaigns or original data		Often faster per placement, requires a strong asset
Broken Link Building	Replacing dead links on relevant pages with your own live content		Ongoing, scalable with consistent prospecting
Link Reclamation	Converting existing unlinked mentions into actual links		Fast per opportunity, limited by mention volume
Linkable Assets	Original content built specifically to earn links passively		Slower to build, compounds over time

Conclusion

Precise link building terminology isn’t academic, it’s the difference between a team that diagnoses a ranking drop correctly and one that guesses, and between a client report that accurately represents what a campaign delivered and one that blurs distinctions that actually matter. Keep this glossary on hand for training new team members, writing client-facing reports, or settling the kind of terminology argument that comes up more often in this industry than most practitioners expect. As generative engine optimization and AI-era terms continue evolving, revisit definitions periodically rather than assuming yesterday’s vocabulary still covers today’s discipline.