Definition
The canonical answer.
Technical SEO is the engineering layer of search visibility: crawlability, indexation, rendering, redirects, canonical URLs, sitemaps, structured data, and page speed. It does not create demand; it removes the failures that silently waste the demand a site has
Worked example
In practice.
A site migration leaves duplicate URLs, self-canonical errors on paginated archives, and a sitemap listing dead pages. Rankings sag with no content change. A technical pass reconciles canonicals, regenerates the sitemap from real routes, fixes redirect chains, and recovers positions without publishing a single
Where this work happens: Search
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