Astro is a modern, open-source web framework designed for building fast, content-driven websites. It prioritizes performance and developer experience by shipping zero JavaScript to the browser by default, a technique called 'Islands Architecture'. This means that only the JavaScript needed for interactive components is sent to the client, drastically improving load times and overall website speed.

Unlike traditional frameworks that send a lot of JavaScript by default, Astro allows you to choose the best tool for each job. You can use your favorite JavaScript frameworks like React, Vue, Svelte, or even use Astro's own UI-agnostic components. This flexibility empowers developers to build sophisticated web applications without compromising on performance.

Astro is ideal for a wide range of projects, including blogs, marketing sites, documentation, e-commerce stores, and portfolios. Its focus on content and speed makes it an excellent choice for SEO and user experience, ensuring your website is accessible and performant for everyone.