Does the Event Loop mechanism in Node.js ensure single-threaded event processing?

Yes, the Event Loop mechanism in Node.js provides single-threaded event processing. This means that all JavaScript code runs in a single thread, and the Event Loop processes events and callbacks from queues sequentially.

However, despite being single-threaded, Node.js can perform asynchronous operations (such as I/O, timers) efficiently without blocking the main thread, thanks to its internal use of threads in libuv for input/output operations.

Thus, the Event Loop manages task execution in a single thread, providing a non-blocking and asynchronous programming model, which allows handling multiple requests simultaneously without creating new threads for each.