An AsyncFunction in JavaScript is a special type of function that is declared with the async keyword.

Unlike regular functions, which return a value or perform an action synchronously, AsyncFunctions return a Promise object and allow for asynchronous programming using the await keyword.

When an AsyncFunction is called, it returns a Promise that resolves with the value returned by the function, or rejects with an error thrown by the function.

Here's an example of an AsyncFunction:

javascript

async function getData() {
  const response = await fetch('https://jsonplaceholder.typicode.com/posts');
  const data = await response.json();
  return data;
}

getData()
  .then(data => console.log(data))
  .catch(error => console.error(error));

In this example, getData is an AsyncFunction that fetches data from a remote API and returns it as a Promise. The await keyword is used to wait for the response from the API before parsing it as JSON and returning the data. The then and catch methods are used to handle the Promise once it resolves or rejects.