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Understanding Asynchronous JavaScript Asynchronous programming is a core concept in JavaScript. It allows you to handle time-consuming operations—such as API requests or file reading—without blocking the main thread. 1. Callbacks Callbacks are functions passed as arguments to other functions and executed after an async operation completes. function fetchData(callback) { setTimeout(() => { callback('Data loaded successfully!'); }, 2000); } fetchData(message => { console.log(message); }); Callbacks work well for simple cases, but they can quickly lead to “Callback Hell” when nesting becomes deep. 2. Promises Promises provide a cleaner way to handle async operations and avoid deeply nested code. const fetchDataPromise = () => { return new Promise((resolve) => { setTimeout(() => resolve('Promise resolved!'), 2000); }); }; fetchDataPromise() .then(data => console.log(data)); Advantages of Promises Better reada...