Technical SEO
Technical SEO ↗
Technical SEO is the task of finding and improving technical problems that prevent search engines from accessing, crawling, rendering, and indexing pages, and that hinder people’s use of the site.
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Digital marketing glossary
Clear explanations of SEO, AI search, content, advertising and analytics, with practical context.
28 terms
Technical SEO
Rendering ↗
Rendering is the process by which a browser or search engine interprets HTML, CSS, and JavaScript resources to construct actual page content. In JavaScript-based sites, making sure that the rendering results are displayed accurately in search engines is a key SEO check item.
Technical SEO
JavaScript SEO ↗
JavaScript SEO checks whether search engines can discover and process script-generated content and links. Inspect response HTML, rendered output and URL access rather than judging by framework name.
Technical SEO
Server-side Rendering ↗
Server-side rendering generates response HTML on the server. It can include content in the initial response, but does not automatically guarantee fast display, successful crawling or indexing.
Technical SEO
Static Site Generation ↗
Static site generation (SSG) is a rendering method that generates and provides page HTML in advance rather than creating it each time it is requested.
Technical SEO
Hydration ↗
Hydration is the process of activating interactive functions by connecting the browser's JavaScript to the static HTML generated on the server. It is the stage where the client-side React/Vue app comes to life after SSR/SSG.
Technical SEO
Crawl Budget ↗
Crawl budget describes the URLs a search engine can and wants to fetch from a site. It matters especially for large or rapidly updated sites; crawl counts are not equivalent to indexed-page counts.
Technical SEO
Crawl Frequency ↗
Crawling frequency is a concept that describes how often a search engine crawler visits a specific page or site to check for changes. Important and frequently changing pages tend to be visited more frequently, and if content changes are reflected late in searches, you should check your crawl frequency.
Technical SEO
Crawl Error ↗
A crawling error is a problem in which a search engine crawler fails or receives a different response than expected while accessing a web page or collecting content. Server errors, 404s, redirect loops, and blocking settings are the main causes, and they must be checked after site migration.
Technical SEO
Indexability ↗
Indexability describes whether a URL meets conditions that allow a search engine to consider it for indexing. Technical accessibility and eligibility do not guarantee actual indexing.
Technical SEO
Noindex ↗
Noindex is a rule that tells search engines that support it not to index a page. Pass it as an HTML meta tag or HTTP response header, and the crawler must be able to read the rules.
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.
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.