Technical SEO
Nofollow ↗
Nofollow is a link rel value that gives Google a hint about handling that link and destination. It does not guarantee a crawl block, indexing exclusion or a fixed reduction in link value.
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Digital marketing glossary
Clear explanations of SEO, AI search, content, advertising and analytics, with practical context.
323 terms
Technical SEO
Robots Meta Tag ↗
The Robots meta tag is a meta tag that controls indexing, link following, and snippet display for each page in the form of `<meta name="robots" content="...">` in the HTML head. Precise control is possible, such as excluding pages from the index with noindex or blocking snippets with nosnippet.
Technical SEO
X-Robots-Tag ↗
X-Robots-Tag supplies indexing and search-display instructions in an HTTP response header. It works for files such as PDFs and images, but does not control access or guarantee immediate removal.
Technical SEO
Redirect Chain ↗
A redirect chain is a state in which redirection continues in several stages, such as URL A leading to URL B, and B leading onward to C.
Technical SEO
Redirect Loop ↗
A redirect loop returns navigation to an earlier URL instead of reaching a usable page. It blocks browser and crawler access, but a brief incident does not prove immediate deletion of every existing indexed URL.
Technical SEO
404 Error ↗
HTTP 404 means the requested resource was not found at that URL. It can be correct for deleted pages; distinguish accidental loss of important content from removal and relocation.
Technical SEO
HTML Sitemap ↗
An HTML sitemap is a page listing site documents that users can view in their browser. Unlike an XML sitemap, it consists of actual a href links and helps resolve deep pages or orphan pages that are difficult to navigate.
Technical SEO
Mobile-first Indexing ↗
Mobile-first indexing means Google primarily uses mobile content for indexing and search evaluation. After the 2023 completion announcement, the remaining desktop-crawled sites moved to smartphone crawling after July 5, 2024.
Technical SEO
Page Speed ↗
Page speed is a comprehensive concept that represents the time it takes for a web page to load in the user's browser, and is measured by various indicators such as LCP, FCP, and TTFB.
Technical SEO
Largest Contentful Paint ↗
Largest Contentful Paint (LCP) is a Core Web Vitals metric that measures when the largest content element (image, text block, etc.) is displayed on the screen during page loading.
Technical SEO
Interaction to Next Paint ↗
Interaction to Next Paint (INP) is a Core Web Vitals metric that measures how long it takes for the next visual update to appear when a user interacts with a page (click, tap, or keyboard input).
Technical SEO
Cumulative Layout Shift ↗
Cumulative Layout Shift (CLS) is a Core Web Vitals metric for unexpected layout shifts. It helps identify problems such as text and buttons moving when images or advertisements appear late.
Technical SEO
First Contentful Paint ↗
FCP is a performance metric that measures when the browser draws the first text or image to the screen. It relates to the initial point at which the user feels the blank screen has ended and is affected by server responsiveness and render-blocking resources.
Technical SEO
Time to First Byte ↗
Time to First Byte (TTFB) is the time it takes for the browser to receive the first byte of the response after sending an HTTP request to the server.
Technical SEO
Image Optimization ↗
Image optimization adjusts image dimensions, format, loading behavior, and alternative text to improve usability and accessibility.
Technical SEO
Structured URL ↗
Structured URL refers to an address designed to express the location or content of a page with consistent rules.
Technical SEO
Log File Analysis ↗
Log file analysis examines request URLs, times, and response statuses recorded by a server or CDN to investigate crawler access and errors.
structured data
Structured Data ↗
Structured data is information that expresses the object and properties of a page in a defined vocabulary and format. On the web, the Schema.org vocabulary and JSON-LD are used to convey the meaning of objects such as articles, products, and organizations.
structured data
Schema Markup ↗
Schema markup is the process of structuring and expressing the objects and properties described by the page using Schema.org's vocabulary.
structured data
Schema.org ↗
Schema.org is a collection of common vocabularies for structurally expressing various objects and properties on the web.
structured data
JSON-LD ↗
JSON-LD is a way to express linked data in JSON format. In web pages, it can be used to pass structured data.
structured data
Microdata ↗
Microdata is a markup method that expresses structured data by directly inserting schema.org vocabulary into the properties of HTML elements.
structured data
RDFa ↗
RDFa is one of the structured data markup methods used to express resource and attribute relationships in HTML documents.
structured data
Rich Snippet ↗
A rich snippet is a search result with details such as a product price or rating beyond the usual title and description. Google documentation uses the term rich result.