At what stage is the event processing cycle initiated in Node.js?

In Node.js, the event loop is initiated immediately after the script starts executing the main module. After the synchronous code runs, Node.js enters the event loop, which handles asynchronous operations such as timers, I/O, and events.

In simpler terms, the event loop starts after all synchronous code in the main file has been executed and continues to work, waiting for and processing events until there are no more tasks in the queues.

This allows Node.js to efficiently handle many asynchronous operations without blocking the main thread.