Remix is a full-stack JavaScript framework for building modern web applications. It focuses on server-rendered React applications with an emphasis on performance, developer experience, and scalability. Remix provides features like server-side rendering, data loading, and client-side hydration out of the box. It promotes a component-based architecture, making it easy to build complex UIs while ensuring fast initial page loads and smooth transitions between pages. Additionally, Remix offers built-in support for authentication, routing, and error handling, empowering developers to create robust and maintainable web applications.