What is asynchronous programming in Node.js?

Can you explain what asynchronous programming is in Node.js?

Asynchronous programming allows Node.js to handle multiple operations concurrently without blocking the execution of code.

Why is asynchronous programming important in Node.js?

It's important because it enables non-blocking I/O operations, making applications more efficient and responsive.

Can you give me an example of asynchronous code in Node.js?

Sure! Here's a simple example using setTimeout:

console.log('Start');
setTimeout(() => {
  console.log('This runs after 2 seconds');
}, 2000);
console.log('End');

This will log 'Start', then 'End', and finally 'This runs after 2 seconds'.

What are callbacks and promises in this context?

Callbacks are functions passed as arguments to handle asynchronous results, while promises represent the eventual completion (or failure) of an asynchronous operation.