---
title: "SEO and content marketing glossary"
description: "Plain-English definitions for 81 SEO, content marketing and AI terms."
url: "https://skribra.com/glossary"
type: "index"
---

# SEO and content marketing glossary

81 terms across 8 categories. Every term has a markdown representation at the same URL with a `.md` suffix.

## SEO Fundamentals

Core concepts every SEO practitioner needs to know

- [Backlink](https://skribra.com/glossary/backlink): A hyperlink from one website pointing to a page on another website, used by search engines as a signal of authority and trust.
- [Domain Authority](https://skribra.com/glossary/domain-authority): A third-party score (0–100) developed by Moz that predicts how likely a website is to rank in search engine results pages based on its backlink profile.
- [SERP](https://skribra.com/glossary/serp): The page Google or another search engine displays in response to a user's query, containing organic results, paid ads, and rich features like featured snippets, image packs, and knowledge panels.
- [Organic Traffic](https://skribra.com/glossary/organic-traffic): Website visitors who arrive through unpaid search engine results, as opposed to paid ads, social media, direct visits, or referral links.
- [PageRank](https://skribra.com/glossary/page-rank): Google's original algorithm that assigns a numerical importance score to web pages based on the quantity and quality of links pointing to them, treating each link as a 'vote' of confidence.
- [Anchor Text](https://skribra.com/glossary/anchor-text): The clickable, visible text of a hyperlink — the words a user sees and clicks to follow a link, which signals to search engines what the destination page is about.
- [Keyword Stuffing](https://skribra.com/glossary/keyword-stuffing): The practice of overloading a web page with keywords or keyword phrases in an attempt to manipulate search rankings — a technique Google explicitly classifies as spam.
- [Duplicate Content](https://skribra.com/glossary/duplicate-content): Substantively identical or very similar content that appears on multiple URLs, either within the same site or across different sites, which can confuse search engines about which version to index and rank.
- [301 Redirect](https://skribra.com/glossary/301-redirect): An HTTP status code that permanently redirects one URL to another, telling browsers and search engines that the original page has moved and passing the majority of its link equity to the new destination.
- [Nofollow](https://skribra.com/glossary/nofollow): A link attribute (`rel='nofollow'`) that instructs search engines not to follow a link or pass link equity (PageRank) to the destination URL.
- [Thin Content](https://skribra.com/glossary/thin-content): Web pages that offer little or no value to users — characterized by very low word count, auto-generated text, scraped content, or pages that are essentially duplicates of other pages with minimal original substance.
- [Page Authority](https://skribra.com/glossary/page-authority): A proprietary score developed by Moz (0–100) that predicts how well a specific page will rank in search engine results, based primarily on its backlink profile.

## Keyword Research

Finding and evaluating the right keywords to target

- [Keyword Difficulty](https://skribra.com/glossary/keyword-difficulty): A score (typically 0–100) that estimates how hard it would be to rank on the first page of Google for a given keyword, based primarily on the authority of pages currently ranking.
- [Search Volume](https://skribra.com/glossary/search-volume): The average number of times a keyword is searched per month in a given location, used to estimate the traffic potential of ranking for that term.
- [Long-Tail Keywords](https://skribra.com/glossary/long-tail-keywords): Specific, multi-word search phrases with lower individual search volume but higher purchase intent and lower competition than broad 'head' keywords.
- [Keyword Intent](https://skribra.com/glossary/keyword-intent): The underlying goal or purpose a user has when typing a search query — categorized as informational, navigational, commercial, or transactional — used to match content format to what searchers actually want.
- [Keyword Clustering](https://skribra.com/glossary/keyword-clustering): The process of grouping semantically related keywords together so that a single piece of content can rank for multiple related search queries simultaneously.
- [LSI Keywords](https://skribra.com/glossary/lsi-keywords): Latent Semantic Indexing keywords are terms and phrases that are semantically related to your main keyword, helping search engines understand the full context and topical depth of your content.
- [Featured Snippet](https://skribra.com/glossary/featured-snippet): A selected search result displayed in a special box at the top of Google's results page that directly answers the search query, showing content extracted from a web page above the standard organic results — often called 'position zero.'
- [People Also Ask](https://skribra.com/glossary/people-also-ask): A dynamic SERP feature showing expandable question-and-answer boxes related to the original search query, appearing on most Google search results pages and sourcing answers from various web pages.
- [Keyword Gap](https://skribra.com/glossary/keyword-gap): The set of keywords that your competitors rank for in search results but your site does not — representing untapped traffic opportunities that competitors are capturing and you are missing.
- [Negative Keyword](https://skribra.com/glossary/negative-keyword): A keyword that you exclude from a paid search or display campaign so that your ads do not appear when that term is part of a user's search query — preventing irrelevant clicks and wasted ad spend.
- [Seed Keyword](https://skribra.com/glossary/seed-keyword): A broad, short keyword (typically 1–2 words) that serves as the starting point for a keyword research process, from which you expand into a comprehensive list of related keywords and phrases.

## Content Strategy

Planning and organizing content for maximum impact

- [Content Pillar](https://skribra.com/glossary/content-pillar): A comprehensive, authoritative piece of content that covers a broad topic in depth and serves as the hub for a cluster of related, more specific articles that link back to it.
- [Topic Cluster](https://skribra.com/glossary/topic-cluster): A content architecture model where a central pillar page on a broad topic is supported by multiple cluster pages covering related sub-topics, all interlinked to demonstrate topical authority.
- [Content Calendar](https://skribra.com/glossary/content-calendar): A planning tool that schedules when and where content will be published, coordinating topics, formats, channels, and deadlines across a content team.
- [Evergreen Content](https://skribra.com/glossary/evergreen-content): Content that remains relevant, accurate, and valuable to readers over a long period of time — weeks, months, or years — without requiring constant updates.
- [Content Audit](https://skribra.com/glossary/content-audit): A systematic review of all existing content on a website to evaluate performance, identify gaps, and decide what to update, consolidate, or remove.
- [Content Brief](https://skribra.com/glossary/content-brief): A document that outlines the goals, target keyword, audience, structure, and requirements for a piece of content before writing begins — serving as the blueprint that aligns strategy, writers, and editors.
- [Content Distribution](https://skribra.com/glossary/content-distribution): The process of sharing and promoting content through multiple channels — including organic search, social media, email, syndication, and paid promotion — to maximize reach beyond direct site visitors.
- [Content Repurposing](https://skribra.com/glossary/content-repurposing): The practice of adapting existing content into new formats or for different channels — such as turning a blog post into a video, podcast episode, infographic, or social media series — to extend reach without creating entirely new content.
- [Content Gap](https://skribra.com/glossary/content-gap): Topics, questions, or user needs that your site's content does not address but that your audience actively searches for — representing missed opportunities that competitors or other sources are capturing.
- [Topical Authority](https://skribra.com/glossary/topical-authority): The degree to which a website is recognized by search engines as a comprehensive, trustworthy source on a specific subject area — built by extensively covering all aspects of a topic cluster with high-quality interlinked content.

## Technical SEO

Under-the-hood optimizations that help search engines crawl and index your site

- [Crawlability](https://skribra.com/glossary/crawlability): The ability of search engine bots to access, navigate, and read the pages on your website without encountering technical barriers.
- [Indexing](https://skribra.com/glossary/indexing): The process by which a search engine stores and organizes crawled web pages in its database so they can be retrieved and displayed in search results.
- [Canonical URL](https://skribra.com/glossary/canonical-url): An HTML tag that tells search engines which version of a page is the preferred, authoritative URL when multiple URLs serve the same or very similar content.
- [Schema Markup](https://skribra.com/glossary/schema-markup): Structured data code added to a web page's HTML that helps search engines understand content context and enables rich results like star ratings, breadcrumbs, product prices, and event details in the SERP.
- [Core Web Vitals](https://skribra.com/glossary/core-web-vitals): Google's set of real-world user experience metrics — Largest Contentful Paint (LCP), Interaction to Next Paint (INP), and Cumulative Layout Shift (CLS) — used as ranking signals in the Page Experience update.
- [Robots.txt](https://skribra.com/glossary/robots-txt): A plain text file at the root of a website (e.g., example.com/robots.txt) that instructs search engine crawlers which pages or sections they are and are not allowed to crawl.
- [XML Sitemap](https://skribra.com/glossary/sitemap): A file (typically in XML format) that lists all the important URLs on a website, helping search engines discover and crawl content more efficiently.
- [Page Speed](https://skribra.com/glossary/page-speed): The amount of time it takes for a web page to load and become usable for a visitor — a direct Google ranking factor measured by Core Web Vitals metrics including Largest Contentful Paint, Interaction to Next Paint, and Cumulative Layout Shift.
- [Mobile-First Indexing](https://skribra.com/glossary/mobile-first-indexing): Google's practice of using the mobile version of a website's content as the primary version for indexing and ranking — meaning Google crawls and evaluates your mobile site, not your desktop site, when determining how to rank your pages.
- [Hreflang](https://skribra.com/glossary/hreflang): An HTML attribute that specifies the language and optional regional targeting of a web page, helping search engines serve the correct language or regional version of a page to users in different countries or language groups.
- [Open Graph](https://skribra.com/glossary/open-graph): A protocol developed by Facebook that uses `<meta>` tags in a page's `<head>` to control how content appears when shared on social media platforms — defining the title, description, image, and URL shown in link previews.
- [Internal Linking](https://skribra.com/glossary/internal-linking): Links from one page on your website to another page on the same website — used to help users navigate, distribute link equity (PageRank) between pages, and signal to search engines the relative importance and topical relationships of your content.
- [Breadcrumbs](https://skribra.com/glossary/breadcrumbs): A navigation element showing the user's location within a website's hierarchy (e.g., Home > Blog > SEO > Keyword Research), which also appears in Google search results when properly marked up with structured data.
- [HTTPS](https://skribra.com/glossary/https): HyperText Transfer Protocol Secure — the encrypted version of HTTP that secures data transmission between a user's browser and a web server using TLS/SSL certificates, protecting against data interception and man-in-the-middle attacks.
- [JavaScript SEO](https://skribra.com/glossary/javascript-seo): The practice of ensuring that JavaScript-rendered content on websites is properly crawled, rendered, and indexed by search engines — addressing the challenges that arise when content is generated dynamically in the browser rather than served in static HTML.
- [URL Structure](https://skribra.com/glossary/url-structure): The format and organization of a website's URLs — including their length, use of keywords, directory hierarchy, and readability — which affects both search engine understanding of page content and user experience.

## Link Building

Earning and managing backlinks to boost authority

- [Link Equity](https://skribra.com/glossary/link-equity): The SEO value and ranking power passed from one page to another through hyperlinks — sometimes called 'link juice' — determining how much of a linking page's authority is transferred to the pages it links to.
- [Guest Posting](https://skribra.com/glossary/guest-posting): The practice of writing and publishing content on another website or blog, typically in exchange for a backlink to your own site — one of the most common white-hat link building tactics.
- [Broken Link Building](https://skribra.com/glossary/broken-link-building): A link building tactic where you find dead links on other websites that point to non-existent pages, create or identify equivalent content on your site, then notify the webmaster and suggest your page as a replacement.
- [Digital PR](https://skribra.com/glossary/digital-pr): A link building and brand awareness strategy that earns high-quality editorial backlinks from news outlets, industry publications, and authoritative websites by creating and distributing genuinely newsworthy content — such as original research, data studies, or compelling stories.
- [Link Reclamation](https://skribra.com/glossary/link-reclamation): The process of finding and recovering lost or broken backlinks that previously pointed to your site — including redirecting broken inbound links, converting unlinked brand mentions into links, and recovering links lost due to URL changes.
- [Skyscraper Technique](https://skribra.com/glossary/skyscraper-technique): A link building strategy coined by Brian Dean of Backlinko that involves finding popular content with many backlinks, creating a significantly better version of that content, then reaching out to everyone who linked to the original to suggest your superior resource.

## Analytics & Measurement

Metrics and tools for tracking SEO performance

- [Click-Through Rate (CTR)](https://skribra.com/glossary/click-through-rate): The percentage of users who click on a search result after seeing it in the SERP, calculated as (clicks ÷ impressions) × 100.
- [Bounce Rate](https://skribra.com/glossary/bounce-rate): The percentage of sessions in which a user visits only one page on your website and leaves without interacting further, as measured by Google Analytics.
- [Impressions](https://skribra.com/glossary/impressions): The number of times a URL from your website appeared in a Google search result, regardless of whether the user scrolled to see it or clicked on it.
- [A/B Testing](https://skribra.com/glossary/a-b-testing): A controlled experiment in which two or more versions of a web page, email, or element are shown to different audience segments to determine which performs better against a defined metric.
- [Conversion Rate](https://skribra.com/glossary/conversion-rate): The percentage of visitors who complete a desired action (purchase, sign-up, download, inquiry) on a website — calculated as conversions divided by total visitors multiplied by 100.
- [Dwell Time](https://skribra.com/glossary/dwell-time): The amount of time a user spends on a page after clicking on it from search results, before returning to the search results page — used as an indirect indicator of content satisfaction and relevance.
- [Google Search Console](https://skribra.com/glossary/google-search-console): A free tool from Google that provides data and diagnostic information about how your website performs in Google Search — including which queries drive traffic, which pages are indexed, Core Web Vitals scores, crawl errors, and manual action notifications.
- [Google Analytics](https://skribra.com/glossary/google-analytics): A free web analytics platform by Google that tracks and reports website traffic, user behavior, and conversion data — providing insights into how visitors find, navigate, and interact with a website.
- [Crawl Errors](https://skribra.com/glossary/crawl-errors): Problems that search engine crawlers encounter when attempting to access and process pages on a website — including HTTP errors (404, 500), redirect issues, and DNS failures — which prevent pages from being properly indexed.
- [Heatmap](https://skribra.com/glossary/heatmap): A visual analytics tool that displays user interaction data — such as where people click, how far they scroll, and where their mouse moves — as color-coded overlays on a web page, with hotter colors indicating higher activity.

## AI & Automation

Artificial intelligence concepts reshaping content and SEO

- [AI Content Generation](https://skribra.com/glossary/ai-content-generation): The use of large language models (LLMs) and related AI technologies to automatically produce written content such as blog articles, product descriptions, social media posts, and SEO copy.
- [A2A Protocol](https://skribra.com/glossary/a2a-protocol): An open standard introduced by Google in April 2025 that enables AI agents to discover, communicate with, and delegate tasks to each other autonomously across different platforms and vendors.
- [Prompt Engineering](https://skribra.com/glossary/prompt-engineering): The practice of designing and refining the instructions given to AI language models to achieve specific, accurate, and useful outputs — encompassing techniques like few-shot examples, chain-of-thought instructions, role assignment, and output format specification.
- [Large Language Model](https://skribra.com/glossary/large-language-model): A type of artificial intelligence system trained on massive amounts of text data to understand and generate human language — the technology underlying tools like ChatGPT, Claude, and Gemini that powers modern AI writing, analysis, and content tools.
- [RAG (Retrieval-Augmented Generation)](https://skribra.com/glossary/rag): An AI architecture that enhances Large Language Model outputs by retrieving relevant information from an external knowledge base before generating a response — combining the language fluency of LLMs with the accuracy of targeted document retrieval.
- [MCP (Model Context Protocol)](https://skribra.com/glossary/mcp-protocol): An open standard developed by Anthropic that defines how AI applications connect to external tools, data sources, and services — enabling AI models to access real-time information, execute actions, and integrate with existing software systems in a standardized way.
- [AI Agent](https://skribra.com/glossary/ai-agent): An AI system that can autonomously plan and execute multi-step tasks by using tools, making decisions, and taking actions in a sequence — going beyond single-turn question-and-answer to complete complex workflows with minimal human intervention.

## Content Creation

Best practices for writing content that ranks and converts

- [E-E-A-T](https://skribra.com/glossary/e-e-a-t): Experience, Expertise, Authoritativeness, and Trustworthiness — Google's framework for evaluating content quality, used by human Quality Raters to assess search result quality and inform algorithm development.
- [Meta Description](https://skribra.com/glossary/meta-description): An HTML attribute that provides a 150–160 character summary of a web page, often displayed as the snippet text beneath the title link in search engine results.
- [Title Tag](https://skribra.com/glossary/title-tag): An HTML element that specifies the title of a web page, displayed as the clickable headline in search engine results and in browser tabs — one of the most important on-page SEO elements.
- [H1 Tag](https://skribra.com/glossary/h1-tag): The primary HTML heading element (`<h1>`) that identifies the main topic of a web page — used by both users and search engines to understand what the page is about, and typically displayed as the largest, most prominent text on the page.
- [Alt Text](https://skribra.com/glossary/alt-text): The `alt` attribute of an HTML `<img>` element — a text description of an image that displays when the image fails to load, assists screen readers for visually impaired users, and helps search engines understand image content.
- [Call to Action](https://skribra.com/glossary/call-to-action): A prompt — typically a button, link, or directive phrase — that encourages a user to take a specific next step, such as signing up, downloading, buying, or contacting — designed to convert visitors into leads or customers.
- [Readability](https://skribra.com/glossary/readability): How easily a reader can understand and navigate written content — determined by factors including sentence length, paragraph structure, vocabulary level, use of headings, and visual formatting.
- [Content Length](https://skribra.com/glossary/content-length): The word count or depth of a piece of web content — a factor that influences how comprehensively a page covers its topic, affects user engagement, and correlates (without directly causing) with higher search rankings.
- [Headline](https://skribra.com/glossary/headline): The primary title of a piece of content that serves as the first impression for both search engine results and readers — determining whether users click on a link, continue reading an article, or move on.

## Machine-readable index

- HTML version of this page: https://skribra.com/glossary
- Site index for agents: https://skribra.com/llms.txt
- Sitemap: https://skribra.com/sitemap.xml
- Public REST API: https://skribra.com/api/v1
- OpenAPI specification: https://skribra.com/openapi.json