<ul><li>Polyfills are used to ensure compatibility with older browsers and enable the use of modern APIs.</li><li>Common use cases for polyfills include supporting older browsers, using modern APIs, and implementing progressive enhancement.</li><li>Examples of common polyfills include Promises, Fetch API, and Array.prototype.includes().</li><li>Pros of using polyfills include improved browser compatibility and preventing feature breakage in unsupported environments, but they can also add performance overhead and increase bundle size.</li></ul>

What Are Polyfills, Why Do We Need Them, and When Should You Use Them?

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