Heading Tags (H1~H6)
In one line
Heading tags (H1 through H6) define a page's title hierarchy in HTML, signalling content structure to both users and search engines.
Going deeper
Heading tags express hierarchy: H1 for the page topic, H2 for major sections, H3 and below for subpoints. Most pages should have exactly one H1, with meaningful nesting underneath.
Pages with clean heading structure are easier for users to scan and easier for Google to lift into featured snippets or AI Overviews. Phrasing core user questions as literal H2s and H3s often raises citation odds noticeably.
A common mistake is using heading tags as font-size shortcuts — sprinkling H3s for emphasis or wrapping sidebar widgets in H2. That breaks the semantic structure of the page and costs you on both SEO and accessibility.
Related terms
Title Tag
The title tag is the HTML element that defines a page's title — the blue link text shown in search results and one of the strongest on-page ranking signals you can control.
SEOInternal Linking
Internal linking is the practice of connecting pages within the same domain — and it shapes crawl efficiency, how authority flows between pages, and how users move through the site.
SEOThin Content
Thin content is content that adds little or no value for users — shallow, duplicated, or auto-generated — and it tends to get downgraded under Google's quality systems.
GEO·AEOAI Overview
Google AI Overviews is the AI-generated summary that appears above the standard results in Google Search — one of the most prominent zero-click surfaces today.
SEOSchema.org
Schema.org is the shared vocabulary co-sponsored by Google, Microsoft, Yahoo and Yandex that lets you label what each page means so search engines and AI can understand it.
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