Name: Outpace SEO
Address: 3000 Sunset Ln, Oklahoma City, OK, 73120, US
Telephone: (405) 544-0208
Price range: $$$

Hallucination (AI): Hallucination is the catastrophic phenomenon where a Large Language Model (LLM) confidently generates and outputs information that is completely false, factually incorrect, or logically impossible, presenting it as absolute truth.
HARO (Help a Reporter Out): HARO (Help a Reporter Out), now transitioning to Connectively, is a massive online platform that connects journalists from top-tier publications (like Forbes, The New York Times, and industry magazines) with expert sources.
Head Term: A head term (or short-tail keyword) is a broad, highly competitive search query typically consisting of one or two words (e.g., "shoes," "insurance," or "CRM").
Header Tags (H1–H6): Header tags (H1 through H6) are HTML elements used to establish the semantic structure and topical hierarchy of a webpage.
Heatmap: A heatmap is a data visualization tool that shows exactly how users interact with a webpage, using a color-coded system to represent the intensity of user activity (clicks, scrolls, and mouse movement).
Helpful Content Update: The Helpful Content Update (HCU), first rolled out in 2022, is a massive, ongoing algorithmic signal designed specifically to penalize content created "primarily for search engines rather than humans." The HCU introduced a sitewide, machine-learning classifier that evaluates the overall user experience of a domain.
Hero Content: Hero content refers to massive, highly resource-intensive, "tentpole" marketing campaigns designed to generate massive brand awareness, viral social sharing, and high-authority backlinks.
Hidden Text: Hidden text is a black hat SEO tactic where text is placed on a webpage in a way that is readable by search engine crawlers but invisible to human users (e.g., white text on a white background, or text positioned entirely off-screen via CSS).
Hilltop Algorithm: The Hilltop Algorithm, acquired by Google in 2003, was a highly influential, early algorithmic update that fundamentally shifted how search engines evaluated backlinks.
How-To Schema: How-To Schema is a highly specific structured data markup used to tag articles that provide step-by-step instructions for completing a task (e.g., "How to tie a tie" or "How to change a tire").
Hreflang Tag: The hreflang tag (rel="alternate" hreflang="x") is an HTML attribute used to specify the language and geographical targeting of a webpage.
HTML (HyperText Markup Language): HTML (HyperText Markup Language) is the foundational coding language used to structure and display every single webpage on the internet.
HTTP Header: An HTTP header is the invisible metadata exchanged between a web server and a client (like a browser or Googlebot) during a network request, preceding the actual HTML content of the webpage.
HTTP Status Codes: HTTP status codes are standardized three-digit server responses indicating the outcome of a search engine crawler's or user's request to access a webpage.
HTTP vs. HTTPS: HTTP (Hypertext Transfer Protocol) is the standard protocol used to transmit data between a web server and a user's browser.
HTTP/2 Protocol: HTTP/2 is a major revision of the HTTP network protocol used by the World Wide Web, designed to significantly decrease latency and improve page load speed.
HTTPS / SSL Certificate: HTTPS (Hypertext Transfer Protocol Secure) is the encrypted version of HTTP, ensuring that all data transferred between a user's browser and the website's server is secure.
Hub and Spoke Model: The hub and spoke model is an advanced site architecture and content strategy where a single, comprehensive "pillar page" (the hub) covers a broad subject (e.g., "SEO Strategy"), and is systematically linked to dozens of highly specific "cluster pages" (the spokes) that cover subtopics in extreme detail (e.g., "Keyword Research," "Technical SEO," "Link Building").
Hyperlocal SEO: Hyperlocal SEO is the highly granular optimization strategy of targeting search queries down to the specific neighborhood, street, or even block level, rather than just targeting a broad city name.

SEO & AI Glossary