what is event event loop in nodejs?,wat is call back hell?wat is promise/diffrrerence betwen promise and promise.all

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Accepted Answer

Event loop manages asynchronous operations in Node.js. Callback hell is a situation where nested callbacks become unreadable. Promises are a way to handle asynchronous operations in a more readable way.

Event loop manages the execution of asynchronous operations in Node.js
Callback hell is a situation where nested callbacks become unreadable and difficult to maintain
Promises are a way to handle asynchronous operations in a more readable and maintainable way
Promise.all is a method that takes an array of promises and returns a new promise that resolves when all of the input promises have resolved

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