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<h1>
The most important heading.
The `<h1>` to `<h6>` tags are used to define HTML headings. `<h1>` defines the most important heading. `<h6>` defines the least important heading. Search engines use the headings to index the structure and content of your web pages. Users often skim a page by its headings. It is important to use headings to show the document structure.