Node.js FAQ: Top Questions

The Event Loop is the core mechanism in Node.js that handles asynchronous operations by processing events in a single-threaded, non-blocking manner.

• Phases: Timers, pending callbacks, idle/prepare, poll, check, close callbacks.
• Non-Blocking: Defers I/O tasks (e.g., file, network) to the system, processing callbacks when complete.
• Libuv: The library managing the event loop and thread pool.
• Use Case: Enables high concurrency for I/O-heavy apps.