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One of the most compelling features of JavaScript is its support for asynchronous programming. This is a method of handling operations that allows other tasks to continue running in the background while awaiting the operation's completion.

In JavaScript, Promises and async/await syntax are two features that make asynchronous programming more manageable.

A Promise is an object representing a value which may not be available yet but will be resolved at some point in the future. Promises can help you manage asynchronous operations without getting stuck in callback hell.

Async/await is a syntactic sugar built on top of Promises, introduced in ES2017, which makes asynchronous code look and behave more like synchronous code. The async keyword makes a function return a Promise, and the await keyword can be used inside an async function to wait for a Promise to be resolved.

These features have dramatically improved JavaScript's ability to handle complex operations without blocking the main thread, thereby enhancing the user experience on JavaScript-powered websites and applications.