async async is a javascript function that is used to define an asynchronous function. When a function is declared with async, it automatically returns a promise, and it allows the use of the await keyword within the function body. Asynchronous functions are particularly useful for handling operations that take time to complete, such as network requests, file I/O, or database queries. By using `async`, we can write code that looks synchronous but operates asynchronously, making it easier to read and maintain. When an `async` function is called, it returns a promise. If the function returns a value, the promise is resolved with that value. If the function throws an error, the promise is rejected with that error. Inside an `async` function, the `await` keyword can be used to pause the execution of the function until a promise is resolved or rejected. This allows you to work with asynchronous code more synchronously, avoiding the need for complex promise chains or callback functions. ...