<ul><li>Unhandled promise rejections in JavaScript can lead to silent failures, missing data, broken features, or security holes.</li><li>Unlike synchronous errors, unhandled promise rejections happen asynchronously, may not crash your script, and are not always immediately visible.</li><li>Adding a `.catch()` handler after a promise rejection does not retroactively fix the issue; it needs to be handled immediately.</li><li>To prevent silent failures, it is crucial to attach a `.catch()` to every promise in JavaScript or use `try/catch` with `async/await`.</li></ul>

The Silent Threat: Unhandled Promise Rejections in JavaScript

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