SEO
GLOSSARY.
The definitive technical SEO knowledge base. Decode the jargon and master the mechanics of search.
SEO Terms Dictionary
404 Error
A 404 Not Found error is an HTTP status code indicating that the server could not find the requested webpage. This occurs when URLs are broken, pages are deleted, or links are incorrectly typed.
410 Gone
The 410 Gone status code tells search engines that the requested resource has been permanently deleted and will not be returning.
500 Internal Server Error
The 500 Internal Server Error is a generic HTTP status code that indicates something has gone wrong on the website's server, but the server cannot be more specific about what the exact problem is.
503 Service Unavailable
The 503 Service Unavailable status code indicates that the server is temporarily unable to handle the request, usually due to maintenance or overloading.
Alt Text
Alt text (alternative text) describes an image on a webpage. It appears if the image fails to load and helps screen-reading tools describe images to visually impaired readers.
Anchor Text
The visible, clickable text in a hyperlink. Search engines use anchor text to understand the context and topic of the destination page.
Backlinks
Links from one website to a page on another website. Also known as "inbound links" or "incoming links," they are one of the most important ranking factors for Google.
Breadcrumb Navigation
Breadcrumbs are a secondary navigation scheme that reveals the user's location in a website or web application (e.g., Home > Men > Shoes > Boots).
Broken Links
A broken link (dead link) is a hyperlink on a webpage that points to a non-existent destination, usually resulting in a 404 error.
Canonical Tag
A canonical tag (rel="canonical") is an HTML snippet that definitively tells search engines which version of a URL is the "master" copy to index, preventing duplicate content penalties.
Client-Side Rendering (CSR)
Client-Side Rendering is a method where the browser downloads a minimal HTML file and uses JavaScript to fetch data and build the page content dynamically in the user's browser.
Content Freshness
Content freshness is a ranking signal that prioritizes recently published or updated content for queries where timeliness matters.
Core Web Vitals
Core Web Vitals are a set of specific factors that Google considers important in a webpage's overall user experience, specifically focusing on loading speed, interactivity, and visual stability.
Cornerstone Content
The most important, comprehensive articles on your website. They are the high-value pages you want to rank for your hardest keywords and serve as the foundation of your content strategy.
Crawl Budget
Crawl budget is the number of pages search engine bots (like Googlebot) are willing and able to crawl on your website within a specific timeframe.
Domain Authority
A search engine ranking score (developed by Moz) that predicts how likely a website is to rank on search engine result pages (SERPs). Scores range from 1 to 100.
Duplicate Content
Duplicate content refers to substantive blocks of content within or across domains that either completely match other content or are appreciably similar.
Favicon
A favicon (short for "favorite icon") is the small 16x16 pixel image shown in browser tabs, bookmark lists, and increasingly, in Google mobile search results.
Featured Snippets
A featured snippet (or "Position Zero") is a summary of an answer to a user's query, which is displayed on top of Google search results.
Heading Tags (H1-H6)
Heading tags (H1 to H6) are HTML elements used to define headings and subheadings on a webpage, providing structure and hierarchy to content.
Hreflang Tag
The hreflang attribute (rel="alternate" hreflang="x") is the signal that tells Google which language or regional version of a page to serve to a user based on their location and browser settings.
Keyword Cannibalization
Keyword cannibalization occurs when multiple pages on your website compete for the same keyword ranking, confusing Google and diluting your site's authority.
Keyword Density
Keyword density is the percentage of times a keyword or phrase appears on a web page compared to the total number of words on the page.
Keyword Research
The process of finding and analyzing search terms that people enter into search engines. The goal is to use this data for a specific purpose, often for SEO or general marketing.
Knowledge Graph
Google's massive database of real-world entities (people, places, things) and the relationships between them. It powers the "Knowledge Panels" seen in search results.
Lazy Loading
Lazy loading is a technique that defers the loading of non-critical resources (like images or videos) until they are needed (i.e., when they scroll into view).
Link Juice
A slang term in SEO that refers to the value or equity passed from one page to another via hyperlinks. This value flows through your site and helps pages rank.
Long-Tail Keywords
Highly specific search queries that tend to have lower search volumes but higher conversion rates. They are often 3+ words long.
Meta Description
A meta description is an HTML tag that summarizes a page's content. Search engines often use it as the snippet text displayed beneath the headline in search results.
Mobile-First Indexing
Mobile-first indexing means Google predominantly uses the mobile version of the content for indexing and ranking. Sites must ensure their mobile pages contain all important content and structured data.
Open Graph Protocol
Open Graph (OG) tags control how your URLs are displayed when shared on social media platforms like Facebook, LinkedIn, and Twitter.
Orphan Pages
An orphan page is a webpage that has no internal links pointing to it. It is isolated from the rest of the site's structure, making it hard for users and bots to find.
Readability
Readability refers to how easy it is for a visitor to read and understand your text. It is influenced by sentence length, vocabulary complexity, and formatting.
Robots.txt
The robots.txt file is the gatekeeper of your website. It provides instructions to web crawlers (like Googlebot) on which pages they are allowed to access and which they must avoid.
SERP
SERP stands for Search Engine Results Page, the page displayed by Google or other search engines in response to a user's query. It includes organic listings, ads, featured snippets, and knowledge panels.
SSL/HTTPS
HTTPS (Hypertext Transfer Protocol Secure) uses SSL/TLS encryption to secure the data transferred between a user's browser and your website server.
Search Intent
Search intent is the "why" behind a search query, representing the user's primary goal when typing a phrase into Google. Understanding intent helps create content that matches what users actually want to find.
Security Headers
HTTP security headers are response headers sent by your server that strictly enforce security policies in the user's browser, preventing attacks like XSS, Clickjacking, and Code Injection.
Server-Side Rendering (SSR)
Server-Side Rendering is a method where the server constructs the full HTML page with all content populated before sending it to the browser.
Soft 404
A Soft 404 occurs when a server returns a success code (200 OK) for a page that doesn't exist or has little to no content, confusing search engines.
Structured Data (Schema.org)
Structured data is a standardized code format (Schema.org) added to a webpage to help search engines understand the specific type of content (e.g., "This is a Recipe," "This is a Review," "This is a Product").
Thin Content
Thin content refers to pages with very little or low-value content that offer minimal value to the user (e.g., automatically generated pages, scraped content, or empty pages).
Time to First Byte (TTFB)
Time to First Byte (TTFB) measures the time between the browser requesting a page and receiving the very first byte of information from the server.
Title Tag
The title tag is an HTML element that specifies the title of a web page. It is displayed on search engine results pages (SERPs) as the clickable headline.
Topic Clusters
An SEO strategy that focuses on owning a broad topic rather than just targeting individual keywords. It involves creating a main "pillar" page and multiple supporting "cluster" pages interlinked together.
Trailing Slash
A trailing slash is the forward slash "/" at the end of a URL (e.g., example.com/page/ vs example.com/page). Inconsistent use can create duplicate content issues, so pick one format and use 301 redirects.
Twitter Cards
Twitter Cards are meta tags that allow you to attach rich photos, videos, and media experiences to Tweets, driving more traffic to your website.