Glossary · H

14 terms starting with H.

AI

Hallucination

When a language model generates plausible-sounding but factually incorrect information — often citing fake sources, dates, or quotes.

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Frontend

Header

The top area of a page containing logo, navigation, and primary CTA.

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SEO

Heading Tags

The HTML tags h1 through h6 that structure page content hierarchically.

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Web

Headless CMS

A CMS that stores content and exposes it via API, without dictating the frontend.

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Analytics

Heatmap

A visualization showing where users click, scroll, and hover on a page.

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Design

Hero Section

The above-the-fold homepage section with headline, sub-headline, and CTA.

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Web

Homepage

The landing page for your root domain — usually the highest-traffic page.

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Infrastructure

Hosting

The service running your site on servers connected to the internet.

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Frontend

HTML

HyperText Markup Language — the standard for structuring web pages.

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Frontend

HTMX

A JavaScript library that adds AJAX, WebSocket, and SSE capabilities via HTML attributes — enabling interactive apps without writing JavaScript.

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Backend

HTTP Status Code

A three-digit number the server returns to indicate a request's outcome.

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Security

HTTPS

HTTP over TLS — the encrypted version of the web protocol.

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Mobile

Hybrid App

A mobile app built with web tech wrapped in a native shell.

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Frontend

Hydration

The process where server-rendered HTML becomes interactive as JavaScript attaches.

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