When the callback function delivers a promise, promise chaining occurs. It allows you to chain on another promise and then conduct a function when the second promise is completed. Catch can still be used to deal with any problems that arise along the process.
It's a non-blocking, asynchronous language. Javascript does not run in parallel, but rather executes one function/Promise at a time.
Promises are the most straightforward way to handle asynchronous actions. They are more efficient than callbacks and events in handling multiple asynchronous operations and handling errors.
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