Many developers think Node.js is “single-threaded” but that’s only part of the story.

🔹 Event Loop
The event loop is the heart of Node.js. It handles asynchronous tasks like I/O, timers, and callbacks — keeping apps fast and responsive without blocking.

🔹 But what about multiple threads?
Behind the scenes, Node.js uses the libuv thread pool for tasks like file I/O, DNS lookups, and crypto operations.

And with Worker Threads, we can run heavy CPU-bound tasks in parallel — without freezing the event loop.

👉 Practical example:
When I built a GPS tracking system, thousands of location updates were processed in real-time.

💡 The event loop handled incoming socket connections efficiently.
💡 Worker Threads offloaded CPU-heavy tasks like geofence checks and route calculations.
💡 Result: smooth, scalable, and low-latency tracking.
💡 Lesson: Node.js isn’t just about non-blocking I/O it’s also about knowing when to stay single-threaded and when to leverage multi-threading