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Svelte is a radical approach to building user interfaces. Whereas frameworks like React and Vue do the bulk of their work in the browser (using a "Virtual DOM"), Svelte shifts that work into a compile step that happens when you build your app. This means Svelte compiles your code into tiny, imperative vanilla JavaScript modules. The result is an application with no framework overhead and blazing-fast performance. It requires less code to write the same functionality compared to other frameworks. For businesses building performance-critical applications or widgets that need to load instantly on mobile devices (like news apps or embedded dashboards), Svelte offers the best performance-to-weight ratio in the industry, ensuring a smooth user experience even on low-end devices.