Astro is an open-source web framework designed for content-driven websites such as blogs, documentation, and marketing pages, emphasizing performance by shipping zero JavaScript to the browser unless a component explicitly needs it.
The site offers thorough documentation covering project setup, routing, content collections, and Markdown authoring, plus a large ecosystem of integrations that connect Astro to CMSs, styling tools, and deployment platforms.
It suits frontend developers who want to compose pages from React, Vue, Svelte, or Solid components while keeping the default payload lean, and it helps teams migrate slow multi-page sites to a faster, framework-agnostic foundation.
Compared with Next.js it focuses more on static and content sites than full-stack apps, and compared with plain static generators it adds component islands and modern tooling without forcing a heavy runtime.
Keep interactive islands small to preserve the performance benefit, prefer content collections for structured data, and review adapter support for your target host before deploying to server or edge environments.