Explain how the `process.nextTick()` function in Node.js affects the order of execution within the event loop, and in what scenarios is it critical?

`process.nextTick()` allows you to schedule a callback function to be executed after the current operation completes but *beforethe event loop continues to its next iteration. This means the callback is executed before any I/O events, timers, or other callbacks in the task queue. It essentially defers the execution of a function until the next tick of the event loop. When `process.nextTick(callback)` is called, the `callback` is added to a special queue called the 'next tick queue'. After the current operation on the call stack finishes executing, the event loop will check the next tick queue. If th....