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Technical SEOmeaning and examples

Technical SEO: making sure search engines can reach, read and store your pages.

Since 201565+ in-house team6 cities

Updated 9 Oct 2026

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Definition

Technical SEO is the setup work that lets search engines find, read and store your pages, and that keeps them fast and steady for people on a phone. SEO stands for search engine optimisation.

You can write a very good page and still lose, if the search engine cannot reach it. Technical SEO is the plumbing. When it works, nobody notices. When it breaks, nothing else matters.

What it covers

  • Crawling: can search engine crawlers reach your pages? This involves your links, your robots.txt file and your sitemap.
  • Indexing: are the pages you want stored actually stored? This involves noindex rules and canonical tags. See indexing.
  • Mobile: Google says it uses the mobile version of a site's content for indexing and ranking.
  • Speed and feel: measured by Core Web Vitals.
  • Labels: structured data that tells search engines what a page is. See schema markup.
  • Moves: redirects, when a page changes its address. See 301 redirect.

Core Web Vitals in plain words

On its web.dev site, Google gives targets for three measures. We read them on 9 October 2026. The targets are checked at the 75th percentile of page loads, split by mobile and desktop. That means most visits, not just the fastest ones, should meet the target.

  • LCP (largest contentful paint): how soon the main content appears. The target is within 2.5 seconds of when the page starts to load.
  • INP (interaction to next paint): how quickly the page reacts when someone taps or clicks. The target is 200 milliseconds or less.
  • CLS (cumulative layout shift): how much the page jumps around while it loads. The target is 0.1 or less.

Mobile-first indexing

Google says it uses the mobile version of a site's content, crawled with the smartphone agent, for indexing and ranking. So the phone version of your page should hold the same main content as the desktop version.

A made-up example

A parts manufacturer relaunches its website with 200 pages. A month later, its owner opens the Page indexing report in Search Console and sees that 60 product pages are not indexed.

The cause is simple. The new site was built on a test address, and a noindex rule was copied across to the live pages. Google says a noindex rule drops a page from search results. The team removes the rule, checks that robots.txt does not block the pages, and lists them in the sitemap. This is a typical technical SEO fix. It involves no new writing.

Where technical SEO stops

Google's starter guide says that compelling, useful content will likely influence your presence in search more than the other tips in the guide. Technical SEO gets your pages to the starting line. The content has to run the race.

Common mistakes

  • Leaving a noindex rule on after a launch.
  • Changing page addresses without redirects.
  • Listing redirected or blocked pages in the sitemap.
  • Chasing a perfect speed score and ignoring the real targets above.
  • Fixing technical points on thin pages that have nothing useful to say.

Related terms

  • Indexing: when a search engine stores a page so it can be shown in results.
  • Sitemap: a file that lists the pages you want search engines to find.
  • Robots.txt: a file that tells crawlers which parts of a site not to fetch.
  • Canonical tag: a line of code that names the main version of a page.
  • Core Web Vitals: Google's measures of how fast and steady a page feels.
  • Crawl budget: how many pages a search engine will fetch from your site in a given time.

Read our technical SEO audit guide for Indian websites and our Core Web Vitals and site speed guide. For a check of your own site, see our SEO work.

Sources

  • web.dev, "Web Vitals" (web.dev/articles/vitals), read 9 October 2026.
  • Google Search Central, "Mobile-first indexing best practices" (developers.google.com/search/docs/crawling-indexing/mobile/mobile-sites-mobile-first-indexing), read 9 October 2026.
  • Google Search Central, "Block Search indexing with noindex" (developers.google.com/search/docs/crawling-indexing/block-indexing), read 9 October 2026.
  • Search Console Help, "Page indexing report" (support.google.com/webmasters/answer/7440203), read 9 October 2026.
  • Google Search Central, "SEO Starter Guide" (developers.google.com/search/docs/fundamentals/seo-starter-guide), read 9 October 2026.

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Straight answers.

  • It is the setup work that lets search engines crawl, read and store your pages, and keeps them fast and steady on a phone.

  • On web.dev, Google gives LCP within 2.5 seconds, INP of 200 milliseconds or less and CLS of 0.1 or less. These are checked at the 75th percentile of page loads. That means most visits, not just the fastest ones, should meet the target. LCP is how soon the main content appears.

  • No. Google's starter guide says compelling, useful content will likely influence your presence in search more than its other tips. Technical SEO gets your pages to the starting line and makes sure the content can be found. Fixing technical points on thin pages that have nothing useful to say helps little.

  • Open the Page indexing report in Search Console to see which pages are not indexed. In the page's made-up example, 60 product pages were missing because a noindex rule was copied to the live pages. Also check that robots.txt does not block the pages and that the sitemap lists them.