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SEO Glossary, 46+ Terms Explained

A comprehensive glossary of SEO terms, jargon, and acronyms. Each definition includes practical context and links to the ANO SEO tool that helps you act on it.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A

Alt Text

Alt text (alternative text) is a description added to an HTML image tag that tells search engines and screen readers what the image depicts. It's important for image SEO and web accessibility. Good alt text is descriptive, concise, and includes relevant keywords naturally.

B

Backlink

A backlink is a hyperlink from one website to another. Backlinks are one of Google's most important ranking factors because they act as "votes of confidence" from other sites. The quality and relevance of backlinks matter more than quantity, one link from a high-authority site is worth more than hundreds from low-quality sites.

Bounce Rate

Bounce rate is the percentage of visitors who leave your website after viewing only one page without taking any further action. A high bounce rate may indicate that your content doesn't match search intent, your page loads too slowly, or your user experience needs improvement.

C

Canonical URL

A canonical URL is the preferred version of a webpage when multiple URLs contain similar or identical content. The <link rel="canonical"> tag tells search engines which version to index and rank, preventing duplicate content issues that can dilute your page's ranking power.

Click-Through Rate (CTR)

CTR is the percentage of people who click on your link after seeing it in search results. It's calculated as clicks divided by impressions. A higher CTR indicates that your title tag and meta description are compelling. CTR is influenced by your ranking position, title wording, and presence of rich snippets.

Content Gap

A content gap is a topic or keyword that your competitors rank for but you don't. Identifying content gaps reveals opportunities to create new content that can capture search traffic your site is currently missing. Content gap analysis is a key strategy for competitive SEO.

Core Web Vitals

Core Web Vitals are a set of Google metrics measuring real-world user experience: Largest Contentful Paint (loading speed), Interaction to Next Paint (interactivity), and Cumulative Layout Shift (visual stability). They are confirmed Google ranking factors and can be checked in Google Search Console.

CPC (Cost Per Click)

CPC is the average amount advertisers pay for a single click on a paid search ad for a specific keyword. In SEO, CPC data helps estimate the commercial value of organic traffic, keywords with high CPC are typically more valuable to rank for because they indicate strong buyer intent.

Crawl Budget

Crawl budget is the number of pages a search engine will crawl on your site within a given time period. For large websites, optimizing crawl budget (via robots.txt, internal linking, and removing low-value pages) ensures that your most important pages get crawled and indexed regularly.

D

Domain Authority

Domain Authority (DA) is a score developed by Moz that predicts how likely a website is to rank in search results. It ranges from 1 to 100, with higher scores indicating greater ranking potential. While not a Google ranking factor itself, DA is a useful proxy for a site's overall SEO strength.

E

E-E-A-T

E-E-A-T stands for Experience, Expertise, Authoritativeness, and Trustworthiness. It's a framework Google uses in its Search Quality Rater Guidelines to evaluate content quality. Pages demonstrating first-hand experience, subject matter expertise, authority in the field, and trustworthiness are more likely to rank well, especially for YMYL (Your Money or Your Life) topics.

F

Featured Snippet

A featured snippet is a special search result that appears at the top of Google's organic results (position zero). It displays a direct answer extracted from a webpage, along with the page title and URL. Earning featured snippets can dramatically increase your visibility and click-through rate.

G

Google Algorithm Update

A Google algorithm update is a change to Google's search ranking systems that can affect how websites are ranked in search results. Major updates (like core updates, helpful content updates, and spam updates) are announced by Google and can cause significant ranking fluctuations. Staying informed about updates helps you adapt your SEO strategy proactively.

H

H1 Tag

The H1 tag is the main heading of a webpage, defined in HTML as <h1>. It should describe the page's primary topic and typically contains the target keyword. Best practice is to have exactly one H1 per page, making it distinct from H2-H6 subheadings that organize the content hierarchy.

I

Impressions

In SEO, an impression occurs every time your URL appears in search results, regardless of whether the user clicks on it. Tracking impressions in Google Search Console helps you understand your visibility for specific queries and identify opportunities where you appear but don't get clicks.

Internal Linking

Internal linking is the practice of linking one page of your website to another page on the same website. Internal links help search engines discover and understand the structure of your site, distribute link equity (ranking power) across pages, and guide users to related content.

Indexing

Indexing is the process by which search engines store and organize web pages in their database (index) so they can be returned in search results. A page must be crawled and then indexed before it can appear in Google. You can check your site's indexing status in Google Search Console under the "Pages" report.

J

JSON-LD

JSON-LD (JavaScript Object Notation for Linked Data) is Google's preferred format for implementing structured data (schema markup) on web pages. It's added as a <script type="application/ld+json"> block in the HTML head, making it easy to add without modifying the page's visible HTML. It enables rich results like FAQ accordions, star ratings, and product info in search results.

K

Keyword Cannibalization

Keyword cannibalization occurs when multiple pages on your website target the same keyword, causing them to compete against each other in search results. This splits your ranking signals (backlinks, content authority) across multiple pages instead of consolidating them on one strong page. Fix it by merging competing pages or differentiating their target keywords.

Keyword Density

Keyword density is the percentage of times a target keyword appears in a piece of content relative to the total word count. While no longer a primary ranking factor, maintaining a natural keyword density (1-2%) helps signal relevance without triggering keyword stuffing penalties.

Keyword Difficulty

Keyword difficulty (KD) is a metric that estimates how hard it would be to rank on the first page of Google for a specific keyword. It considers factors like the authority and quality of currently ranking pages. Low-difficulty keywords are ideal targets for newer websites with lower domain authority.

L

Long-Tail Keyword

A long-tail keyword is a specific, multi-word search phrase (typically 3+ words) that has lower search volume but higher conversion intent. Examples: "best running shoes for flat feet" vs. "running shoes." Long-tail keywords are easier to rank for and often indicate a user who is closer to making a decision.

Link Building

Link building is the process of acquiring hyperlinks from other websites to your own. Since backlinks are one of Google's top ranking factors, link building is a core SEO strategy. Effective tactics include creating linkable content (research, tools, guides), guest posting, broken link building, and digital PR. Quality always matters more than quantity.

M

Meta Description

A meta description is an HTML attribute that provides a brief summary of a webpage's content. It appears below the title in search results and influences click-through rate. Optimal length is 120-160 characters. While not a direct ranking factor, a well-written meta description increases the likelihood that searchers will click your result.

Mobile-First Indexing

Mobile-first indexing means Google primarily uses the mobile version of a page for indexing and ranking. If your website looks different on mobile vs desktop, Google will base its ranking decisions on the mobile version. This makes responsive design, mobile page speed, and mobile usability critical for SEO.

N

NoFollow

NoFollow (rel="nofollow") is a link attribute that tells search engines not to pass link equity (ranking power) through a hyperlink. It's typically used for paid links, user-generated content (comments), and untrusted sources. Google treats nofollow as a "hint" rather than a strict directive.

O

Open Graph

Open Graph is a protocol created by Facebook that uses meta tags to control how URLs are displayed when shared on social media. OG tags specify the title, description, image, and type of content that appears in social share cards on Facebook, LinkedIn, Twitter/X, and messaging apps.

On-Page SEO

On-page SEO refers to optimizations made directly on a webpage to improve its search rankings. This includes optimizing title tags, meta descriptions, heading structure, content quality, internal links, image alt text, URL structure, and page speed. On-page SEO is fully within your control, unlike off-page factors like backlinks.

Off-Page SEO

Off-page SEO encompasses all optimization activities done outside your website to improve its rankings. The primary off-page factor is backlinks, but it also includes brand mentions, social signals, local citations, and digital PR. Off-page SEO builds your site's authority and reputation in the eyes of search engines.

Organic Traffic

Organic traffic refers to visitors who arrive at your website through unpaid search engine results (as opposed to paid ads, social media, or direct visits). Growing organic traffic is the primary goal of SEO, as it provides a sustainable, free source of qualified visitors over time.

P

Page Authority

Page Authority (PA) is a Moz metric that predicts how well a specific page will rank in search results, on a scale of 1-100. Unlike Domain Authority (which measures the entire domain), PA evaluates individual pages based on their link profile, content quality, and other factors. Higher PA means better ranking potential for that specific page.

People Also Ask (PAA)

People Also Ask is a Google SERP feature that displays a list of related questions that users frequently search for. Each question expands to show a brief answer extracted from a webpage. Optimizing your content to answer PAA questions can earn additional SERP visibility and drive traffic to your site.

Q

Query

In SEO, a query (or search query) is the word or phrase a user types into a search engine. Understanding the queries your target audience uses is fundamental to keyword research. Queries can be informational ("how to bake bread"), navigational ("facebook login"), or transactional ("buy running shoes online").

R

Redirect (301 vs 302)

A redirect sends users and search engines from one URL to another. A 301 redirect is permanent and passes most link equity to the new URL, use it for moved pages. A 302 redirect is temporary and tells search engines to keep indexing the original URL. Using the wrong type can cause ranking issues and lost link equity.

Robots.txt

Robots.txt is a text file at the root of a website that tells search engine crawlers which pages or sections they should or should not crawl. It helps manage crawl budget and can be used to block AI training bots. Note: robots.txt doesn't prevent indexing, use noindex meta tags for that.

S

Schema Markup

Schema markup (structured data) is a standardized format for providing information about a page's content to search engines. It uses the Schema.org vocabulary in JSON-LD, Microdata, or RDFa format. Schema enables rich results like star ratings, FAQs, recipes, events, and product information in search results.

Search Intent

Search intent (user intent) is the purpose behind a search query, what the user actually wants to accomplish. The four main types are: informational (learn something), navigational (find a specific site), commercial (research before buying), and transactional (make a purchase). Matching content to search intent is critical for ranking.

SERP

SERP stands for Search Engine Results Page, the page displayed by Google (or other search engines) after a user submits a query. Modern SERPs include organic results, paid ads, featured snippets, knowledge panels, image carousels, "People Also Ask" boxes, and local pack results.

Sitemap

A sitemap (XML sitemap) is a file that lists all the important pages on your website, helping search engines discover, crawl, and index your content. Sitemaps include metadata like last modification date and priority. You can submit your sitemap through Google Search Console and reference it in your robots.txt file.

T

Technical SEO

Technical SEO refers to optimizations that help search engines crawl, index, and render your website efficiently. It covers site speed, mobile-friendliness, HTTPS, XML sitemaps, robots.txt, canonical tags, structured data, JavaScript rendering, and crawl error resolution. Technical SEO ensures your content can be found and understood by search engines.

Title Tag

The title tag is an HTML element (<title>) that specifies the title of a webpage. It appears as the clickable headline in search engine results and in browser tabs. Title tags are one of the most important on-page SEO elements. Best practices: 50-60 characters, include primary keyword near the beginning, make each page's title unique.

U

URL Structure

URL structure refers to the format and organization of your webpage addresses. SEO-friendly URLs are short, descriptive, use hyphens to separate words, include target keywords, and follow a logical hierarchy. Example: example.com/blog/keyword-research-guide is better than example.com/p?id=12345. Clean URLs improve both user experience and search engine understanding.

User Experience (UX)

User Experience encompasses all aspects of a user's interaction with your website, navigation, page speed, readability, mobile usability, and content quality. Google increasingly uses UX signals (Core Web Vitals, bounce rate, dwell time) as ranking factors. A site that's fast, easy to navigate, and provides valuable content will rank better over time.

V

Voice Search

Voice search is the use of spoken language to perform search queries via smart assistants (Google Assistant, Siri, Alexa). Voice queries tend to be longer, more conversational, and question-based compared to typed searches. Optimizing for voice search means targeting natural language phrases, answering questions concisely, and earning featured snippets.

W

Web Crawling

Web crawling (spidering) is the process by which search engine bots systematically browse the internet to discover and download web pages. Googlebot, Bingbot, and other crawlers follow links between pages to find new content. You can control crawling via robots.txt and optimize it through clean internal linking and XML sitemaps.

Y

YMYL (Your Money Your Life)

YMYL stands for "Your Money or Your Life", Google's category for pages that could significantly impact a person's health, finances, safety, or well-being. YMYL pages are held to higher quality standards and require strong E-E-A-T signals. Examples include medical advice, financial guidance, legal information, and news about important events.

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