Async Iterators are a special type of iterator in JavaScript that allow you to work with asynchronous data streams. They enable you to process data one piece at a time, using the `for await...of` loop. This is particularly useful when dealing with data that arrives over time, such as responses from a fetch request or data from a WebSocket. With Async Iterators, you can pause execution until the next piece of data is available, making your code cleaner and easier to read. They are defined using the `Symbol.asyncIterator` method, which returns an object with a `next()` method that returns a promise. This helps manage asynchronous operations without deeply nested callbacks.