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• Init Project -> Top Level Code -> Require Modules -> Event Callback Register -> CPU Task Offload to thread pool (4-128) -> Event Loop -> Expired Timer -> IO Pooling -> Set Immediate Callback ->Close callback ->exit

The Node.js event loop is a crucial aspect that enables non-blocking I/O operations despite JavaScript being single-threaded

1. Timers Phase: Executes callbacks scheduled by setTimeout() and setInterval().
2. Pending Callbacks Phase: Executes I/O callbacks deferred to the next loop iteration.
3. Idle, Prepare Phase: Internally used phases.
4. Poll Phase: Retrieves new I/O events and executes I/O-related callbacks, blocking when necessary. It can transition to the next phase if certain conditions are met.
5. Check Phase: Executes setImmediate() callbacks immediately after the poll phase, if scheduled.
6. Close Callbacks Phase: Handles close callbacks, such as 'close' events for sockets.