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The markup that gives a web page its structure: headings, links, forms, images, and sections.
HTML is the skeleton of a web page. React and Next.js still produce HTML in the end, even when the code starts as components. Good HTML helps accessibility, SEO, and browser behavior because it tells the page what each thing is, not just how it looks.
Plainly
Think of HTML as a named building block in a big LEGO app. The markup that gives a web page its structure: headings, links, forms, images, and sections.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.