SEO & Backlink Glossary
150 SEO and backlink terms explained in plain English.
150 terms
A
Agentic Outreach
Outreach that is planned and carried out largely by AI agents — software that can research prospects, write personalised messages, and manage follow-ups with minimal human input.
AI Link Building
Using AI tools to speed up link building — from finding prospects and analysing backlink data to drafting outreach emails and content.
Algorithm Update
A change made by search engines to how they rank websites. These updates affect which websites show up first when people search for something online.
Alt Text
The hidden description of an image on a webpage that helps search engines understand what the picture shows. It also helps people who can't see the image.
Anchor Text
The clickable words in a link that you can see and click on a webpage. It's usually blue and underlined, telling you what you'll find if you click it.
Authority
How trustworthy and important a website is considered by search engines. Websites with high authority are seen as experts in their field and rank better in search results.
Authority Score
A third-party metric (popularised by Semrush) that estimates a domain's overall strength and trustworthiness on a 0–100 scale, based on backlinks, traffic, and spam signals.
Automated Link Building
Using software or tools to create links to your website automatically instead of earning them naturally. This approach is generally discouraged by search engines.
B
Backlink
A link from another website that points to your website. These are like votes of confidence from other sites and help search engines decide how important your site is.
Backlink Profile
A backlink profile is the complete set of backlinks pointing to a website, judged as a whole: how many there are, which sites they come from, what anchor text they use, and how natural the pattern looks.
Black Hat SEO
Dishonest tactics used to trick search engines into ranking a website higher. These methods break search engine rules and can get websites banned or severely penalized.
Brand Mentions
When your company or website name appears on other websites, social media, or online content, even without a link. These mentions help build awareness and authority.
Broken Link Building
A technique where you find broken links on websites, create content similar to what the broken link pointed to, then ask the website owner to link to your content instead.
Business Directory
An online listing where businesses provide their contact details and services. Getting listed in quality directories helps local SEO and builds trust with customers and search engines.
C
Canonical URL
The preferred version of a webpage when multiple pages have similar content. It tells search engines which version to show in search results to avoid duplicate content issues.
Citation
A mention of your business name, address, and phone number online, even without a link. Citations on trusted sites help search engines verify your business is real and improve local rankings.
Citation Flow
A Majestic metric scoring a URL or domain from 0–100 based on how many links point to it — a measure of link quantity and influence, not quality.
Click-Through Rate (CTR)
The percentage of people who click on your link after seeing it in search results. Higher CTR means more people found your title and description appealing enough to visit your site.
Content Marketing
Creating and sharing valuable content to attract and keep customers. Rather than directly selling, content marketing provides useful information that helps and interests your target audience.
Content Syndication
Republishing the same piece of content on one or more other websites to reach a wider audience — usually with a link back to the original.
Crawling
The process where search engines send out robots (called crawlers) to find and scan webpages. These robots follow links to discover content and gather information for search results.
D
Digital PR
Building relationships with online publications, bloggers, and influencers to gain coverage for your brand. It combines traditional PR with digital marketing to increase online visibility and earn backlinks.
Directory Submission
Adding your website to online directories that list businesses or websites. Quality directory listings can increase visibility, improve local SEO, and create backlinks.
Disavow Tool
A Google tool that lets website owners tell Google to ignore bad or spammy links pointing to their site. It helps prevent penalty from low-quality backlinks you can't remove.
Do-Follow Link
A regular link that passes ranking value from one site to another. These links help the linked site rank better in search results by transferring some authority from the linking page.
Domain Authority
A score from 1-100 that predicts how well a website will rank in search results. Higher scores mean the site is more likely to rank well. It's based on many factors like age, size, and backlinks.
Domain Rating
Domain Rating (DR) is a 0 to 100 score of how strong a website's backlink profile is, popularised by Ahrefs and calculated on a logarithmic scale. A higher Domain Rating means a stronger, more authoritative link profile.
E
E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness)
The key factors Google uses to evaluate content quality. It stands for Experience, Expertise, Authoritativeness, and Trustworthiness—qualities that help Google determine if content is reliable and valuable.
Earned Media
Publicity gained through promotional efforts other than paid advertising. This includes news coverage, social media mentions, reviews, and shares that you earn through creating valuable content or noteworthy actions.
Editorial Link
A backlink a publisher adds naturally because they find your content genuinely useful — not paid for, exchanged, or self-placed. Widely seen as the highest-quality kind of link.
Email Deliverability
The ability of your emails to actually reach recipients' inboxes rather than being blocked or sent to spam. Crucial for outreach and cold email campaigns.
Email Outreach
The process of contacting website owners, bloggers, or journalists via email to build relationships that might lead to backlinks, guest posting opportunities, or media coverage.
Engagement Metrics
Statistics that show how users interact with your website, such as time on page, bounce rate, and click-through rate. These metrics help you understand if visitors find your content valuable and interesting.
External Link
A link from your website that points to a different website. These links send visitors away from your site but can improve user experience by connecting them to helpful resources.
F
Featured Snippet
A selected search result that appears in a box at the top of Google search results. It briefly answers the searcher's question and is sometimes called "position zero" because it appears above the regular results.
First Link Priority
A rule where search engines only count the first link to a page when multiple links point to the same URL from a single page. This affects how you structure navigation and content links.
Follow Link
A link that passes authority and ranking power from one webpage to another. These links vote for the credibility of the linked page and help search engines determine its importance.
Follow-up Email
A follow-up message sent after an initial outreach email that got no reply, gently nudging the recipient. Follow-ups often generate more responses than the first email.
Forum Link Building
Creating backlinks by participating in online forums and including links to your website where relevant. When done naturally as part of helpful contributions, it can build authority and drive targeted traffic.
Freshness
How recent and up-to-date your content is. For some topics, search engines prefer newer content because it's more likely to contain current information.
G
Generative Engine Optimization
Optimising your content to be surfaced and cited by AI-powered answer engines like ChatGPT, Google AI Overviews, and Perplexity — the AI-era counterpart to traditional SEO.
Geographic Targeting
Customizing your website and SEO strategy to reach people in specific locations. This is crucial for businesses serving particular areas or offering location-specific services.
Google Analytics
A free tool from Google that tracks and reports website traffic. It shows where visitors come from, what they do on your site, and helps you understand if your SEO efforts are working.
Google Search Console
A free tool from Google that helps you monitor and troubleshoot your website's presence in Google search results. It shows which keywords bring visitors to your site and alerts you to technical problems.
Growth Hacking
Using creative, low-cost strategies to gain users and grow businesses quickly. Growth hackers combine marketing, product development, and analytics to find unconventional ways to expand rapidly.
Guest Posting
Writing content for another website, usually in exchange for a backlink to your site. It helps you reach new audiences, build authority, and earn quality backlinks.
H
HARO (Help a Reporter Out)
A service that connects journalists looking for sources with experts who can provide quotes, often earning the expert a backlink and media coverage.
Hidden Text
Content that is visible to search engines but not to human visitors, typically implemented through CSS manipulation, tiny font sizes, or matching text and background colors, considered a black-hat SEO technique.
Hreflang
An HTML attribute that tells search engines which language and geographical targeting a specific page has, helping serve the right content to users based on their location and language preferences.
HTML Sitemap
A webpage that lists and links to all important pages on your website in a hierarchical structure, helping both users and search engines navigate and discover your content.
HTTP Status Codes
Standardized response codes returned by web servers that indicate the status of an HTTP request, helping diagnose issues with webpage accessibility and informing search engines about content availability.
Hummingbird Algorithm
A major Google search algorithm update launched in 2013 that improved semantic search capabilities by analyzing user intent and contextual meaning rather than focusing solely on individual keywords.
I
Image SEO
The practice of optimizing images for search engines through proper file formatting, compression, descriptive filenames, alt text, and structured data to improve visibility in image search and enhance webpage performance.
Inbound Link
A hyperlink from an external website pointing to your site, also called a backlink, serving as a vote of confidence that helps establish authority, credibility, and improved search engine rankings.
Indexing
The process by which search engines add webpages to their database, analyzing and storing content for later retrieval when relevant to user searches.
Influencer Outreach
The strategic process of building relationships with influential individuals in your industry to amplify content, earn backlinks, increase brand visibility, and reach new audiences through collaborative opportunities.
Internal Linking
The practice of connecting pages within the same website using hyperlinks, creating pathways for users and search engines to navigate site structure while distributing page authority throughout the domain.
J
JavaScript SEO
The specialized practice of optimizing JavaScript-heavy websites to ensure search engines can properly crawl, render, and index content that depends on client-side execution for complete visibility.
John Mueller (Google's Search Advocate)
A Senior Webmaster Trends Analyst at Google who communicates search engine guidelines, clarifies ranking factors, and provides technical SEO advice through various official channels and community interactions.
JSON-LD
A lightweight data format for implementing structured data that helps search engines understand page content by embedding JSON markup in a script tag rather than within HTML, simplifying schema implementation.
Juice (Link Juice)
A colloquial term describing the ranking power or authority passed from one webpage to another through hyperlinks, based on the concept that links act as "votes" that transfer value between pages.
Junk Links
Low-quality backlinks from irrelevant, spammy, or manipulative sources that provide little value and potentially harm a website's search rankings by triggering algorithmic penalties or manual actions.
K
Keyword Density
The percentage of times a keyword or phrase appears on a webpage compared to the total number of words, once used as a primary ranking factor but now less emphasized in modern SEO.
Keyword Difficulty
A score, usually 0–100, that estimates how hard it would be to rank on the first page of search results for a given keyword, based mainly on the strength of the sites already ranking.
Keyword Research
The systematic process of discovering and analyzing search terms people use in search engines, helping identify valuable opportunities to target content based on search volume, competition, and relevance.
Keyword Stuffing
The manipulative practice of overloading web content with excessive keyword usage in an unnatural way, often resulting in poor user experience and potential search engine penalties.
Knowledge Graph
Google's semantic database that collects information about people, places, and things to understand relationships between entities and deliver enriched search results with factual information.
KPI (Key Performance Indicator)
Measurable values that demonstrate how effectively a website or digital marketing campaign is achieving key business objectives, helping track progress and inform strategic decisions.
L
Link Audit
A systematic evaluation of a website's backlink profile to identify high-quality links, potentially harmful links, and opportunities for improvement to maintain a healthy link profile.
Link Building
The strategic process of acquiring hyperlinks from other websites to your own, improving search visibility by increasing authority, relevance, and referral traffic through quality backlinks.
Link Equity
The ranking value passed from one page to another through hyperlinks, influenced by the linking page's authority, relevance, and the link's attributes, determining how authority flows throughout a website.
Link Exchange
An arrangement where two websites agree to link to each other for mutual SEO benefit, a practice that can violate search engine guidelines when implemented as a direct reciprocal exchange.
Link Insertion
Adding a backlink to an existing, already-published article on another website — also called a niche edit — rather than creating new content to host the link.
Link Prospect
A website or contact you've identified as a potential source of a backlink — a target you plan to reach out to in a link-building campaign.
Local SEO
Specialized search engine optimization strategies focused on improving visibility for geographically-relevant searches, helping businesses appear in local search results, maps, and location-based queries.
M
Manual Action
A penalty imposed by human reviewers at Google when a website violates Google's webmaster quality guidelines, resulting in reduced visibility or complete removal from search results.
Marketplace Listings
Product or service listings on third-party platforms like Amazon, eBay, or industry-specific marketplaces, requiring specialized optimization strategies to improve visibility within these ecosystems.
Media Pitch
A concise, targeted message sent to a journalist or publication proposing a story, angle, or expert source — the core outreach unit of digital PR.
Meta Description
An HTML attribute that provides a concise summary of a webpage's content, displayed in search results to help users understand what the page contains before clicking through.
Mobile-First Indexing
Google's indexing approach that primarily uses the mobile version of a website's content for indexing and ranking, reflecting the predominance of mobile internet usage.
Monthly Searches
The estimated number of times a specific keyword or phrase is entered into search engines during a one-month period, helping marketers evaluate potential traffic and prioritize keyword targeting.
N
NAP (Name, Address, Phone Number)
The core business information consisting of Name, Address, and Phone number that must remain consistent across all online platforms to strengthen local search rankings and business credibility.
Natural Link Profile
The diverse collection of inbound links to a website that has developed organically over time, characterized by varied sources, anchor texts, and acquisition patterns that appear non-manipulative to search engines.
Negative SEO
Unethical practices aimed at harming a competitor's search rankings through manipulative techniques like toxic backlink building, content scraping, false reviews, or hacking attempts.
Niche Directories
Industry-specific online listings that categorize websites according to their particular market segment, providing targeted referral traffic and relevant backlinks to businesses within specialized sectors.
No-Follow Link
A hyperlink containing the rel="nofollow" HTML attribute that instructs search engines not to transfer ranking authority to the destination URL, though it still enables user navigation and referral traffic.
O
Off-Page SEO
Optimization efforts conducted outside your own website to improve search rankings, primarily focused on building authority through quality backlinks, social signals, and online reputation management.
On-Page SEO
Optimization techniques applied directly to website content and HTML source code to improve search engine rankings, including keyword usage, content quality, HTML tags, and user experience elements.
Online Business Listing
A digital profile containing business information on directories, review platforms, and search engines, serving as a crucial touch point for local SEO, customer acquisition, and brand visibility.
Organic Traffic
Visitors who arrive at a website through unpaid search engine results, representing users actively seeking information related to the site's content without being influenced by paid advertising.
Outbound Link
A hyperlink that directs users from your website to an external domain, signaling topic relevance to search engines while providing additional value to users through authoritative references.
Outreach Personalization
Tailoring each outreach email to its specific recipient — referencing their work, site, or interests — rather than sending an identical generic template to everyone.
P
Page Authority
A metric developed by Moz that predicts a specific page's ranking potential on a 1-100 logarithmic scale based on link data, used for comparing relative strength of pages and tracking improvement over time.
PageRank
Google's original algorithm that evaluates webpage importance based on quantity and quality of inbound links, assigning a value that influences (but no longer solely determines) search result positioning.
PBN (Private Blog Network)
A network of websites controlled by an individual or organization specifically created to build artificial backlinks to a main website, violating search engine guidelines and risking severe penalties.
Penalties
Negative actions taken by search engines against websites that violate webmaster guidelines, resulting in reduced visibility or complete removal from search results, applied either algorithmically or manually.
Product Hunt
A community platform where users discover, share, and discuss new technology products and services, providing startups with launch visibility, feedback, and potential SEO benefits through increased brand mentions and links.
Q
Quality Content
Digital material that satisfies user search intent through comprehensive, accurate, well-structured information delivered in an engaging, accessible format that earns user trust and search engine recognition.
Quality Score
A metric used in paid search platforms that evaluates ad relevance, expected click-through rate, and landing page experience on a 1-10 scale, influencing ad position and cost-per-click rates.
Query
A specific word, phrase, or question entered by users into search engines to find relevant information, products, or services, representing the foundational starting point of the search process.
Quick Answer Box
A prominent SERP feature displaying a concise answer to a query directly in search results, extracted from a webpage that Google identifies as providing the most relevant, trustworthy response.
Quotation Backlinks
Links created when publishers cite and reference original content from your website, providing attribution through both the link and quoted material, generating particularly powerful relevance signals.
R
Ranking Factor
Any element of a website or its broader digital footprint that search engines evaluate when determining where pages should position in search results for specific queries.
Reciprocal Links
A mutual exchange of hyperlinks between two websites, where each site links to the other, potentially providing value when occurring naturally between relevant sites but risking penalties when excessively arranged for manipulation.
Redirect
A server or client-side instruction that automatically routes users and search engines from one URL to another, used for site migrations, structure changes, or consolidating duplicate content while preserving traffic and authority.
Referral Traffic
Visitors who arrive at your website by clicking links on external websites, representing audience acquisition through digital recommendations that often indicate industry relationships, content authority, and brand visibility.
Referring Domain
A referring domain is a unique website that links to your site at least once. Fifty links from one blog still count as a single referring domain, which is why referring domains are a truer measure of reach than raw backlink count.
Relevance
The measure of how closely a webpage's content, purpose, and context matches a user's search query intent, representing a foundational ranking factor that search engines continually refine through increasingly sophisticated algorithms.
S
Search Volume
The number of times a specific keyword or phrase is entered into search engines during a particular timeframe, indicating relative popularity and potential traffic opportunity for content targeting those terms.
SERP (Search Engine Results Page)
The webpage displayed by search engines in response to a user query, containing various result types including organic listings, paid advertisements, featured snippets, knowledge panels, and other specialized content features.
Sitemap
A file that lists the pages of a website to help search engines discover and understand your content structure. It serves as a roadmap for more efficient crawling and indexing.
Skyscraper Technique
A content creation and link building strategy where you find top-performing content in your niche, create something substantially better, then reach out to sites linking to the original content.
Sponsored Post
Content published on another site in exchange for payment, typically to promote a brand. Any links in it should be marked as sponsored or nofollow to comply with search engine guidelines.
Startup Directory
Online platforms that catalog emerging companies and their offerings, providing startups with visibility, potential customer acquisition, backlink opportunities, and investment exposure while offering users organized access to innovative solutions.
T
Technical SEO
The process of optimizing website infrastructure to help search engines efficiently crawl and index content, addressing elements like site speed, mobile responsiveness, structured data, and crawlability.
Technographics
Data about the technology stack a company uses — the software, tools, and platforms behind its website. Marketers use it to find and qualify prospects.
Tiered Link Building
A strategic SEO approach that creates layers of backlinks pointing to your primary links, distributing link equity and authority while protecting your main site from potential penalties.
Toxic Links
Low-quality or manipulative backlinks that can harm your search rankings rather than improve them. These links often come from spammy sites, link farms, or violate search engine guidelines.
Traffic
The total volume of users visiting a website, measured by sessions and pageviews. Traffic can be categorized by source (organic, direct, referral, social, or paid) and quality metrics.
Trust Flow
A metric developed by Majestic that measures the quality of websites linking to yours based on their trustworthiness, indicating how reliable search engines may consider your content.
U
Unique Visitors
A metric that counts individual users who visit your website within a specific timeframe, regardless of how many sessions they initiate. It measures audience reach rather than total traffic volume.
Universal Search
Google's integrated search approach that combines results from different content types (web pages, images, videos, news, maps, etc.) into a single SERP, creating diverse and visually rich results.
Unnatural Links
Backlinks created primarily to manipulate search rankings rather than for legitimate referral purposes. These links violate search engine guidelines and can result in manual actions or algorithmic penalties.
URL Structure
The organization and formatting of web addresses on your site, including folder hierarchy and naming conventions. Well-crafted URLs improve user experience and help search engines understand content relevance.
User Experience (UX)
The overall experience visitors have when interacting with your website, encompassing usability, accessibility, performance, and emotional response. Strong UX leads to better engagement, conversions, and search rankings.
V
Validation
The process of checking whether website code complies with technical standards and specifications, ensuring proper functionality across browsers and devices while supporting accessibility and SEO objectives.
Vertical Search
Specialized search engines or search features that focus on specific types of content, industries, or purposes rather than crawling the entire web, such as shopping search, image search, or travel booking platforms.
Viral Content
Content that spreads rapidly across social media and the internet through user sharing, generating significant visibility and engagement in a short period without proportional paid distribution.
Visibility
A measurement of how prominently a website or webpage appears in search engine results pages (SERPs) for relevant queries, incorporating factors like ranking positions, SERP features, and search volume.
Voice Search
A technology enabling users to perform internet searches by speaking into a device rather than typing, requiring distinct optimization strategies focused on conversational language and direct answers to questions.
W
Web 2.0
The second generation of the World Wide Web characterized by greater user interaction, collaboration, and social networking features, contrasting with the static, read-only nature of early websites.
Webmaster Guidelines
Official documentation from search engines (particularly Google) outlining recommended practices for website creation and optimization, helping site owners understand acceptable techniques and avoid penalties.
Website Authority
A metric estimating a website's credibility and potential ranking power in search engines based on factors like backlink quality, content expertise, and user signals, though not an official Google metric.
White Hat SEO
Ethical search engine optimization practices that comply with search engine guidelines, focusing on creating value for users through quality content, proper technical implementation, and natural link building.
WordPress SEO
Specialized optimization techniques for websites built on the WordPress content management system, leveraging its unique architecture, plugins, and customization options to improve search visibility.
X
X-Robots-Tag
An HTTP header directive that communicates indexing and crawling instructions to search engines for non-HTML files (like PDFs or images) where meta robots tags cannot be implemented.
XHTML
eXtensible HyperText Markup Language, a stricter, XML-based version of HTML that requires well-formed code with proper nesting, closing tags, and precise syntax to ensure cross-platform compatibility.
XML Sitemap
A structured file that lists a website's important pages, images, and files to help search engines discover and understand content for indexing, including information about update frequency and relative importance.
XPath
A query language used to navigate XML documents and HTML web pages, commonly used in web scraping, testing, and automation to target specific elements within a page's structure.
XSS (Cross-Site Scripting)
A security vulnerability that allows attackers to inject malicious client-side scripts into web pages viewed by others, potentially compromising user data or hijacking sessions while damaging website reputation and search rankings.
Y
Yahoo Directory (historical)
A manually curated website directory launched in 1994 that categorized websites by topic and required human review for inclusion, serving as a major internet navigation tool before search engines became sophisticated.
Yandex SEO
The practice of optimizing websites for Russia's dominant search engine, Yandex, which uses distinct algorithms and ranking factors compared to Google, requiring market-specific strategies.
Yield Metrics
Performance measurements that evaluate the productivity and efficiency of SEO efforts relative to inputs, measuring how effectively resources are converted into desired outcomes like traffic, conversions, or revenue.
Yoast SEO
A popular WordPress plugin that provides comprehensive on-page SEO tools including content analysis, metadata management, XML sitemap generation, and technical optimization features with both free and premium versions.
YouTube SEO
The practice of optimizing video content on YouTube to rank higher in both YouTube's internal search results and Google's video search results, focusing on metadata, engagement metrics, and watch time.
Z
Z-pattern Layout
A web design principle based on the natural eye movement pattern of users scanning content in a Z-shaped path from top-left to bottom-right, used to strategically place important elements along this visual flow.
Zero-Click Searches
Search queries that result in no clicks on organic or paid results because the answer is provided directly in the search results page through featured snippets, knowledge panels, or other SERP features.
Zig-Zag Ranking
A search ranking phenomenon where a page's position fluctuates significantly between different positions during algorithm updates or index refreshes, often indicating ranking instability during algorithm evaluation.
Zip Code Targeting
A local SEO technique that optimizes content for specific postal code areas, allowing businesses to precisely target geographical locations smaller than cities but larger than individual addresses.
Zombie Pages
Low-value, outdated, or thin content pages that receive minimal traffic and engagement while consuming crawl budget and potentially diluting site quality signals, often requiring pruning or consolidation.
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