What are JavaScript Promises? How do they differ from callbacks?
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When explaining JavaScript Promises and how they differ from callbacks, focus on key points like asynchronous execution and chaining. Emphasize how Promises allow for cleaner and more manageable code by avoiding the 'callback hell' scenario. Illustrate your understanding with an example of chaining `.then()` methods for sequential asynchronous operations. Also, note their error handling capabilities with `.catch()`.
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