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Asynchronous functions are functions that work in the background while the rest of your code executes. They help solve the uncertainties that might bring about these eventualities. Promises are not different if anything they help with not getting stuck in the callback hell or avoid it altogether if you’d prefer them over callbacks. They are also popularly used, and chances are nearly all if not most of the. and. JavaScript-based. frameworks employ them to associate. objects in JavaScript with an eventual failure reason.