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Stimulus is an open-source JavaScript framework for creating scalable, rich web interfaces. The framework uses simple HTML data attributes to declaratively control interaction logic, allowing developers to enhance server-rendered pages with more dynamic behavior without needing to write much custom JavaScript. It operates on the principle of unobtrusive JavaScript, meaning that it doesn't take control of a page's structure and behaviors but instead layers enhancements on top of existing content. This approach makes Stimulus particularly useful for projects where a full-fledged client-side framework like React or Angular isn't necessary and might be overkill. By focusing on modularity and incremental improvements, Stimulus can help developers maintain clean codebases that are easier to reason about and troubleshoot.