Plain-English definitions for every term you'll encounter when auditing, optimizing, and monitoring your website.
Descriptive text added to an image's HTML tag that screen readers read aloud and search engines use to understand image content. Every meaningful image should have alt text; decorative images should have an empty alt attribute.
Check with Accessibility AgentThe international standard for web accessibility, published by the W3C. Level AA conformance is the most commonly required standard, covering color contrast, keyboard navigation, screen reader support, and form accessibility.
Check with Accessibility AgentThe percentage of visitors who leave your site after viewing only one page. A high bounce rate on a landing page suggests the content doesn't match what visitors expected from the search result or ad that brought them.
The percentage of visitors who complete a desired action — purchasing, signing up, submitting a form. Industry averages range from 1–5% depending on the action and sector.
Check with Conversion Rate AgentThe practice of optimizing your website to be cited by AI-powered search engines like ChatGPT, Perplexity, and Google AI Overviews. Focuses on structured data, content extractability, and third-party corroboration.
Check with GEO Visibility AgentA Core Web Vital that measures how much visible content unexpectedly moves during page load. A CLS score above 0.1 means elements are jumping around — often caused by images without dimensions or late-loading ads.
Check with Performance AgentThree Google metrics that measure real user experience: LCP (loading speed), INP (interactivity), and CLS (visual stability). Sites that pass all three thresholds get a ranking boost.
Check with Performance AgentA Core Web Vital measuring the worst-case delay between a user interaction (tap, click, keypress) and the browser's visual response. The threshold is 200ms. Replaced First Input Delay (FID) in March 2024.
Check with Performance AgentA Core Web Vital that measures how long it takes for the largest visible element (usually a hero image or heading) to render. The threshold is 2.5 seconds on mobile.
Check with Performance AgentThe time from when a browser requests a page to when it receives the first byte of the response. A TTFB over 600ms usually indicates server-side performance issues — slow database queries, missing caching, or distant hosting.
A link from another website pointing to your site. Backlinks are one of Google's strongest ranking signals — the more high-quality, relevant sites link to you, the higher your pages tend to rank.
Check with Backlink AgentA navigational element showing the page's position in the site hierarchy (e.g., Home > Agents > SEO). Breadcrumbs help users navigate and can appear as rich results in Google search listings when marked up with BreadcrumbList schema.
An HTML tag that tells search engines which version of a page is the 'official' one when duplicate or near-duplicate content exists at multiple URLs. Prevents duplicate content penalties and consolidates link equity.
Check with Technical SEO AgentThe number of pages Googlebot will crawl on your site in a given timeframe. Large sites with many broken links, redirect chains, or parameter URLs waste crawl budget on low-value pages.
Check with Broken Links AgentExperience, Expertise, Authoritativeness, and Trustworthiness — Google's framework for evaluating content quality. Pages demonstrating real experience and backed by credible authors rank better, especially for health, finance, and legal topics.
FAQPage structured data markup that lets Google display your questions and answers as expandable dropdowns directly in search results. Increases click-through rate by taking up more visual space on the results page.
Check with Schema Markup AgentA protocol that lets website owners instantly notify search engines when content is created, updated, or deleted. Supported by Bing, Yandex, and others — much faster than waiting for a crawl.
The recommended format for adding structured data (schema markup) to web pages. It's a JavaScript block placed in the page's <head> that describes your content in a machine-readable vocabulary defined by Schema.org.
Check with Schema Markup AgentAn HTML tag providing a brief summary of a page's content. Doesn't directly affect rankings but heavily influences click-through rate — Google displays it as the snippet text below your page title in search results.
Check with SEO AgentA metadata protocol (og: tags) that controls how your pages appear when shared on social media platforms like Facebook, LinkedIn, and Slack. Includes title, description, image, and URL.
Check with SEO AgentWhen a URL redirects to another URL that itself redirects to yet another URL. Each hop adds latency and dilutes link equity. Best practice is a single 301 redirect from old to final destination.
Check with Broken Links AgentEnhanced search listings that include extra visual elements like star ratings, FAQ dropdowns, recipe cards, or event details. Triggered by valid structured data markup and content quality.
Check with Schema Markup AgentA text file at your domain root that tells search engine crawlers which pages or sections of your site they should or shouldn't crawl. It's advisory — crawlers can ignore it — but all major search engines respect it.
A collaborative vocabulary maintained by Google, Bing, Yahoo, and Yandex that defines standardized types and properties for structured data. Using Schema.org markup helps search engines understand your content precisely.
Check with Schema Markup AgentA file listing all the pages on your site that you want search engines to discover and index. Referenced in robots.txt and submitted through Search Console and Bing Webmaster Tools.
An HTTP header that tells browsers which sources are allowed to load scripts, styles, and other resources on your page. A properly configured CSP prevents cross-site scripting (XSS) attacks.
Check with Security AgentA security header that tells browsers to always connect to your site over HTTPS, even if the user types http://. Prevents downgrade attacks and ensures all traffic is encrypted.
Check with Security AgentWhen an HTTPS page loads some resources (images, scripts, fonts) over insecure HTTP. Browsers may block these resources or show security warnings, and it indicates incomplete HTTPS migration.
Check with Security AgentStructured data markup for product pages that can trigger rich results showing price, availability, and review ratings directly in Google search results. Essential for eCommerce SEO.
Check with Shopify Audit AgentRun a free audit on your website and see which of these concepts need attention — in 30 seconds.
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Social Proof
Evidence that other people trust and use your product — testimonials, review scores, customer logos, usage numbers. Placing social proof near CTAs increases conversion rates by reducing perceived risk.
Check with Social Proof Agent