Technical SEO is the invisible foundation that makes a website search engine friendly. It includes code optimization, loading speed, URL structure, indexing, and security (HTTPS). It is key for Google to understand and rank a website well. If a site does not have good technical SEO, no matter how good its content is, it will hardly appear in the top results. Tools like Google Search Console, Screaming Frog, and Ahrefs help analyze and improve these aspects. It is the skeleton that supports any effective web positioning strategy.