Svelte is a modern JavaScript framework used for building user interfaces. Unlike traditional frameworks that run in the browser, Svelte shifts much of the work to compile time, generating efficient JavaScript code that updates the DOM. This results in faster performance and smaller bundle sizes, making applications more responsive. One of Svelte's key features is its simplicity. Developers can create components using a straightforward syntax that combines HTML, CSS, and JavaScript in a single file. This approach makes it easier to manage and understand the code, allowing for quicker development and a more enjoyable coding experience.