SEO and growth glossary
H Terms and Definitions
62 plain-English definitions begin with H. Showing page 1 of 2.
All H definitions
- H1 tag
- An HTML heading tag designating the primary heading of a page or section.
- H2 tag
- An HTML heading tag for second-level headings within a page hierarchy.
- H3 tag
- An HTML heading tag for third-level headings within a page hierarchy.
- H4 tag
- An HTML heading tag for fourth-level headings within a page hierarchy.
- H5 tag
- An HTML heading tag for fifth-level headings within a page hierarchy.
- H6 tag
- An HTML heading tag for sixth-level headings, the deepest heading level.
- Hacked content
- Content placed on a site without the owner's permission as a result of a security compromise.
- Hacked site recovery
- The remediation process to clean a hacked site and restore its standing in search.
- Hallucination
- An AI-generated statement that is plausible but factually incorrect or unsupported by source material.
- Hard 404
- A standard 404 response indicating the requested URL does not exist on the server.
- HARO
- Help a Reporter Out, a former platform connecting journalists with expert sources, succeeded by Connectively.
- Hash URL
- A URL containing a fragment after a hash sign, traditionally not sent to the server.
- Hashbang URL
- A URL using a hash followed by an exclamation mark, used in deprecated AJAX crawling schemes.
- Hawk
- An informal name for a 2017 minor adjustment to Google's Possum local algorithm.
- HCU
- Common abbreviation for Helpful Content Update.
- Head keyword
- A short, high-volume query at the head of the search demand curve.
- Head section
- The HTML head element containing metadata, links, and scripts not displayed inline.
- Head term
- Another name for a head keyword, a short broad query with high search volume.
- Header tag
- Another name for an HTML heading tag.
- Heading hierarchy
- The structured order of heading tags from H1 through H6 on a page.
- Heading tag
- An HTML element from H1 through H6 used to structure document headings.
- Headless browser
- A browser that runs without a graphical interface, used to render pages programmatically.
- Headline formula
- A reusable structural template for writing headlines, often based on tested patterns.
- Help a Reporter Out
- The former name for HARO, the journalist-source matching platform.
- Helpful content
- Content that meaningfully meets user needs, as defined by Google's helpful content guidelines.
- Helpful Content System
- A Google ranking system reducing the visibility of unhelpful, search-engine-first content.
- Helpful Content Update
- A Google update introducing the helpful content system, since folded into core ranking.
- Hero image
- The large lead image at the top of a page, typically the LCP element.
- Hosting
- The service that stores a website's files and serves them to visitors.
- Hotel schema
- A schema.org type representing a hotel and its key attributes.
- How-to article
- An article structured to teach a reader to accomplish a task.
- How-to optimization
- Structuring how-to content for clarity and snippet eligibility.
- How-to rich result
- A SERP rich result displaying ordered steps from how-to structured data, now restricted by Google.
- HowTo schema
- Structured data marking up step-by-step instructions for completing a task.
- Hreflang
- An HTML and HTTP attribute indicating the language and regional targeting of a page's alternate versions.
- Hreflang attribute
- Another name for the hreflang annotation specifying language and region targeting.
- Hreflang conflict
- A condition where hreflang annotations contradict each other or other targeting signals.
- Hreflang error
- A reported issue with a site's hreflang implementation, such as a missing return tag.
- Hreflang for ecommerce
- Implementation of hreflang on multilingual or multinational ecommerce sites.