Astro.js is a web meta-framework that provides a server-first philosophy, zero JavaScript by default approach, and an islands architecture to deliver fast content-driven websites. Astro's core features include its design for content, speed benefits through static generation and server-side rendering, support for JavaScript frameworks, developer love from recent State of JavaScript surveys, and server islands for pre-rendering dynamic parts while keeping the bulk of the page load quickly. Astro also offers a unified way to manage local content using Content Collections, which provides a structured, fully typed, and validated way to manage local content. The framework seamlessly integrates with external data sources like Strapi through its content loader API, making it ideal for teams who care deeply about performance, simplicity, and developer experience.