What it is
Astro is a framework for content-driven websites: docs, blogs, marketing pages, catalogs, media sites, and projects where loading speed matters.
The core idea is to send less JavaScript to the browser by default. Pages can be static, while interactive pieces are added as islands only where needed.
How the approach works
Astro supports `.astro` components, Markdown, MDX, and integrations with React, Vue, Svelte, and other libraries. Teams can use familiar components without making the whole site a heavy client app.
It fits sites where content matters more than complex browser state. Static generation, routing, content collections, and resource optimization are part of the base.
Astro page
This example shows the island idea: most HTML is static, while the interactive component loads separately.
---
import PricingToggle from "../components/PricingToggle.jsx";
const title = "Open Source Catalog";
---
<h1>{title}</h1>
<p>Fast content page with one interactive island.</p>
<PricingToggle client:load />What is inside
The repository contains the Astro core, integrations, examples, developer tools, documentation, and package infrastructure.
Astro is valued for combining modern developer experience with careful browser output: less client code, faster first load, and strong SEO pages.
Practical context
In an Astro project, it helps to separate content, interactive islands, and build-time data early. If everything becomes a client app, Astro’s main advantage disappears.
Strengths and limits
The main strength is not paying a JavaScript cost for every page. Content projects benefit from that.
The limit is product fit. Apps centered on complex client state may use Astro for part of the system rather than as the whole foundation.