SEO Glossary

This glossary explains SEO terminology for business owners, marketing interns, and agencies. Use it as your reference for everything from Core Web Vitals and crawl budget to topic clusters and link equity. We update it to reflect current best practices and algorithms. (Last updated: August 19, 2026)

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301 Redirect

A permanent change of address for a page. When someone (or Google) visits the old URL, they’re automatically sent to the new one, and most of the page’s “reputation” or ranking power goes with it. Use 301s when you rename a page, reorganize your site, or move to a new domain.

302 Redirect

A temporary change of address. It sends people to a different URL for now, but tells search engines the original page is coming back. Use a 302 for short-term tests, promotions, or maintenance windows.

404 Not Found

The page doesn’t exist at that address. Visitors hit a dead end, and search engines eventually drop it from results. A helpful 404 page should offer a search box and links to popular pages, and you should 301 any important retired pages to the best replacement.

410 Gone

A stronger way to say “this page is gone for good.” Search engines usually remove 410 pages from the index faster than a 404. Use this when content is intentionally retired with no replacement.

503 Service Unavailable

Your site (or a page) is temporarily down—often for maintenance or server overload. Pair it with a “Retry-After” header so crawlers know to come back soon and don’t treat it as a broken page.

A

Above the Fold

The part of a page you see before you scroll. Put the most important stuff here: a clear headline, a short intro, and your primary call-to-action. Avoid cramming ads or giant images that push content down.

Algorithm (Search)

The recipe a search engine uses to decide which pages to show and in what order. It weighs hundreds of signals—relevance, speed, links, usability—to pick the best results for the searcher.

Algorithm Update / Core Update

A tune-up to that recipe. Small updates happen often; big “core” updates can reshuffle rankings. You can’t game these—focus on helpful content, good UX, and clean technical health.

Alt Text (Image Alt)

A short description of an image in words. Screen readers read it aloud, and search engines use it to understand the picture. It’s good for accessibility and can help images appear in search.

Anchor Text

The clickable words in a link. If the text says “plumber SEO tips,” search engines learn the destination is about plumber SEO tips. Keep anchor text natural—avoid spammy repetition.

Analytics

Tools that show how people find and use your site—pages viewed, time on page, where they came from, and what they did. Use analytics to see which pages attract search traffic and which convert.

Authority

How trustworthy your site appears on a topic. It grows when you publish useful content, earn reputable links, and users engage. Third-party scores (DA/DR) estimate this, but real authority is earned.

B

A link from another website to yours—like a vote of confidence. A few links from respected, relevant sites usually beat dozens from low-quality ones.

BERT

Google’s language understanding that helps it grasp natural, conversational searches. You don’t optimize for BERT; you write clearly for humans and answer questions directly.

Black Hat SEO

Shortcuts that break search engine rules—like hiding text, buying links, or auto-generating junk pages. They can cause penalties or removal from results.

Bounce Rate

The percentage of visitors who leave after one page. High bounces can mean mismatch or quick answers. Read it with time-on-page and conversions to understand the context.

A simple trail like Home > Services > SEO that shows where you are on a site. Helps navigation and can enhance how your result appears in Google.

CDN (Content Delivery Network)

Worldwide servers that store your assets and serve them from the closest location. Pages load faster—great for users and Core Web Vitals.

C

Canonical URL / rel="canonical"

A tag that tells search engines, “If you find similar pages, treat this one as the main version.” Prevents duplicates from competing and splitting ranking power.

Cloaking

Showing one thing to search engines and another to people. It’s deceptive and against the rules. Use proper rendering, not tricks.

Content Marketing

Creating genuinely useful content—guides, FAQs, case studies, tools—that answers real questions. It earns trust, links, and visibility over time.

Core Web Vitals (LCP, INP, CLS)

Google’s key UX metrics: LCP (how fast main content appears), INP (how responsive interactions feel), and CLS (how stable the layout is). Good scores make your site feel fast and smooth.

Crawl Budget

How many pages a search engine is willing to fetch from your site in a period. Reduce clutter and errors so bots spend time on important pages.

Crawling

How search engines discover pages—bots follow links and sitemaps, fetch your pages, and queue them for indexing.

CTR (Click-Through Rate)

How often people click your result after seeing it. Clear, honest titles and descriptions that match intent raise CTR—more traffic even without a rank change.

D

Disavow

Tell Google to ignore spammy or manipulative links pointing to your site. Use sparingly—mainly after a manual action or clear link spam patterns.

Doorway Pages

Thin, cookie-cutter pages made just to capture searches and funnel visitors elsewhere. They waste people’s time and violate guidelines.

Domain Authority (DA) / Domain Rating (DR)

Third-party scores estimating how strong a site might be based on links. Google doesn’t use these directly; they’re just helpful comparisons.

Duplicate Content

Content appearing at more than one URL. It confuses search engines about which to rank. Fix with consolidation, canonicals, or redirects.

Dwell Time

How long someone stays on your page before returning to results. It’s a rough sign of satisfaction—clear, useful pages keep people longer.

E

E-E-A-T

Experience, Expertise, Authoritativeness, Trustworthiness. Show real-world experience, subject expertise, a solid reputation, and transparent, accurate content—especially for sensitive topics.

Entity

A person, place, thing, or concept recognized by search engines. Clear names, structured data, and consistent references help engines understand and connect your brand or topic.

Evergreen Content

Timeless resources—like how-to guides or glossaries—that stay useful for years. Update them periodically to keep trust and rankings strong.

F

Faceted Navigation

Filter combinations (size, color, price) that can create endless URL variants. Control with canonicals, parameter rules, and internal linking to avoid crawl/index bloat.

The “position-zero” answer box. Win it with concise answers (≈40–60 words), clean lists, or simple tables that match common questions.

Fetch/URL Inspection

Search Console tool to test a live URL, see indexed status, and view rendered HTML. Useful for debugging indexing and JS rendering issues.

G

Google Business Profile (GBP)

Your local listing: name, address, phone, hours, reviews, photos. It powers the Map Pack—keep details accurate, collect reviews, and post updates.

Googlebot

Google’s crawler. Don’t block essential JS/CSS; make sure your important pages are linked and return correct status codes.

Google Search Console (GSC)

Official dashboard for search performance: queries, clicks, indexing, CWV, sitemaps, and manual actions. Use it weekly to spot wins and issues.

Google Index

Google’s database of pages it can show. If a page isn’t indexed, it can’t rank—fix by ensuring it’s crawlable, useful, and not accidentally noindexed.

H

H1–H6 Headings

Page outline for humans and bots. One clear H1, then H2/H3 to structure topics. Good structure improves readability and ToC widgets.

Helpful Content System

Google’s signal to reward people-first content and demote pages made mainly for SEO. Aim for clear answers, depth, and usefulness.

Hreflang

Markup that connects language/region versions of a page (en-US, es-MX). Helps users reach the right version and prevents duplicate confusion.

Hummingbird

A core overhaul focused on understanding meaning and intent, not just keywords. It reinforced writing for people, not for exact matches.

I

Indexing

Making a page eligible to appear in results. Requires discoverability, quality, and no blocking directives. Check status in Search Console.

Links between your pages. They guide users, distribute ranking power, and help search engines understand relationships.

Information Architecture

How content is organized. Shallow, logical hierarchies and clear hubs make navigation and crawling easier.

J

JavaScript SEO

Ensuring JS-rendered content is crawlable and indexable. Consider SSR/hydration or prerendering and test with URL Inspection.

JSON-LD

Google’s preferred format for structured data. Add a small script block to describe your content (FAQ, Product, Article) for rich results.

K

Keyword Cannibalization

Multiple pages targeting the same intent compete with each other. Consolidate or differentiate the pages.

Keyword Difficulty (KD)

A tool’s estimate of how hard it is to rank for a term based on current competitors and links. Use it to prioritize effort—not as a hard rule.

Keyword Stuffing

Overusing keywords unnaturally. It harms readability and can hurt rankings. Write naturally; cover the topic instead of repeating phrases.

KPI (Key Performance Indicator)

The metrics that matter—organic traffic, qualified leads, revenue, or other outcomes that prove SEO impact.

L

Landing Page

The first page a visitor sees from search. Match the query intent closely and guide the next step with clear CTAs.

Earning high-quality backlinks via content, PR, partnerships, and outreach. Focus on quality, relevance, and genuine value.

Ranking power that flows through links. The source, placement, and context affect how much equity a link passes.

Local Pack (Map Pack)

The map + three local results. Ranking is driven by relevance, proximity, and prominence (GBP + reviews + local SEO signals).

Long-Tail Keywords

Specific, lower-volume phrases with clear intent. Often easier to rank and more likely to convert.

LSI (Semantic Coverage)

Colloquial term people use for related wording. Don’t chase lists—cover related concepts naturally and thoroughly.

M

Manual Action

A human-applied Google penalty for rule violations (like link schemes). Fix the issues and submit a reconsideration request.

Meta Description

The short summary shown under your title in results (often). It doesn’t rank you higher but strongly influences clicks—write it like ad copy.

Meta Robots

Per-page indexing directives (index/noindex, follow/nofollow, etc.). Use them to control visibility; don’t block pages in robots.txt if you need Google to see the tag.

Mobile-First Indexing

Google primarily evaluates the mobile version. Ensure content parity and good mobile UX/performance.

MUM

Google’s advanced AI for understanding complex, multi-step queries and multiple content types. It reinforces the value of clear, in-depth content.

N

NAP

Name, Address, Phone. Keep this consistent across your site, GBP, and directories to strengthen local trust signals.

Negative SEO

Attempts to harm a site (spam links, hacks). Monitor security and backlinks; disavow if necessary.

Noindex

A directive to keep a page out of search results. Allow the page to be crawled so Google can see the tag.

Nofollow / UGC / Sponsored

Link attributes to avoid passing equity—use for untrusted or paid links, or user-generated links. Google treats them as hints.

O

Organic Traffic

Unpaid search visits. Track by landing page, query, and conversions to see what SEO is really delivering.

Orphan Pages

Pages with no internal links pointing to them. They’re hard to discover and rarely perform—link them in or remove.

P

Page Experience

Overall UX signals: mobile friendliness, HTTPS, safe browsing, and Core Web Vitals. A good experience supports better outcomes.

PageRank

Google’s original link-based authority model—why quality backlinks still matter. The concept underpins how link equity flows.

Pagination

Splitting long lists across pages. Keep navigation clear, avoid thin pages, and help crawlers find deeper items.

PBN (Private Blog Network)

Networks of sites built to pass links. High risk; can lead to penalties.

PPC (Pay-Per-Click)

Paid search ads. Not SEO, but complementary—use PPC for instant coverage while SEO compounds long-term.

Prerendering

Serving bots a pre-rendered HTML version of JS pages so content is crawlable/indexable. Test with URL Inspection.

Q

QDF (Query Deserves Freshness)

When a topic is hot or time-sensitive, fresher content may get a boost. Update key pages and publish timely posts for these searches.

R

RankBrain

Machine learning that helps Google interpret queries and adjust the weight of ranking signals. Another reason to write for intent, not just keywords.

Rank Tracking

Monitoring positions for target queries. Watch trends and traffic, not just daily movement; rankings are a means to outcomes.

Redirects

Send users and bots from one URL to another. Prefer 301 for permanent moves; keep chains short and map one-to-one when possible.

Rich Results

Enhanced listings (stars, FAQs, prices) powered by structured data. They can improve visibility and clicks.

robots.txt

A file that controls crawling access. Don’t use it to stop indexing—use noindex on the page instead.

S

Schema Markup (Structured Data)

JSON-LD annotations that describe your content to search engines (Article, FAQ, Product). Helps eligibility for rich results and clarifies entities.

Scraping (Web)

See Web Scraping—using software to retrieve webpages and extract selected information into a structured form.

Search Intent

What the searcher is really trying to do—learn, find a site, compare, or buy. Create the type of page that matches the intent.

SERP (Search Engine Results Page)

The page of results, features, and ads. Study it to understand which content format Google prefers for a query.

Sitemap (XML)

A machine-readable list of URLs to aid discovery. Include only canonical, indexable pages and submit it in Search Console.

Site Architecture

Your content’s structure. Logical categories, hubs, and internal links improve crawling and user navigation.

Site Speed / Performance

How fast pages load and respond. Optimize images, scripts, caching, and hosting to improve UX and Web Vitals.

SSL/HTTPS

Encrypts traffic and shows the padlock. It’s a trust signal for users and a basic expectation for modern sites.

Subdomain vs Subdirectory

Both can rank. Subdirectories often consolidate authority more simply; choose based on architecture and maintenance needs.

Structured Data

The broader idea of adding machine-readable meaning to pages (via schema). It helps search engines understand your content.

T

Taxonomy

How you categorize and tag content. Keep categories purposeful and avoid thin tag archives that clutter the index.

Technical SEO

The foundation—crawlability, indexation, performance, mobile, structured data. It lets great content be found and understood.

Thin Content

Pages with little value. Improve, merge, or noindex them so your site reflects quality throughout.

Title Tag

Your clickable headline in search. Make it concise, descriptive, and aligned with the searcher’s intent.

Topic Cluster / Pillar

A comprehensive pillar page supported by focused sub-pages, all interlinked. This structure builds topical authority.

Topical Authority

Demonstrated depth on a subject. Cover the important subtopics well and link them together.

U

URL

The page address. Keep it readable and stable; use hyphens, avoid unnecessary parameters, and don’t change URLs without good reason.

User Experience (UX)

How pleasant and effective your site is to use. Good UX increases trust, engagement, and conversions—supporting long-term SEO success.

UTM Parameters

Tracking tags added to links for campaign analytics. Prevent parameter bloat with canonicals or rules.

V

Search focused on a category—images, news, video, local, shopping. Match the format if you want visibility there.

Spoken, conversational queries. Capture them with clear Q&A formatting and concise, direct answers.

W

Web Scraping

Using software to retrieve pages and extract selected information into a structured form, such as a spreadsheet, database, monitor, or search index. Scraping is a method, not automatically good or bad. A responsible project checks permission or licensing, the site’s terms and robots.txt instructions, access controls, request rate, copyright, and privacy before collecting only the data it needs. Publicly viewable does not mean public domain, and a citation or backlink does not replace permission. Common legitimate uses include auditing your own site, monitoring approved public information, and research with appropriate safeguards. Bypassing a login, paywall, CAPTCHA, or other technical barrier is a major warning sign. Read the plain-English guide to web scraping or use the permission and risk checklist.

Web Vitals

Common shorthand for Core Web Vitals: LCP, INP, and CLS. Improving them makes your site feel fast and reliable.

White Hat SEO

Guideline-compliant optimization that helps users. Sustainable and focused on long-term value.

Webmaster Guidelines / Search Essentials

Google’s rules for technical setup, content quality, and spam. Align with these to avoid surprises.

X

XML Sitemap

See Sitemap (XML)—a machine-readable list of URLs to aid discovery and indexing.

Y

YMYL (Your Money or Your Life)

Topics that impact health, finances, or safety. They demand high E-E-A-T: qualified authors, cited sources, and strong accuracy.

Z

Zero-Click Searches

Queries answered directly on the SERP (featured snippets, panels). Earn visibility with concise answers and strong brand/entity presence.

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