Understand how Node.js handles thousands of tasks without creating a thread for every request.
Node.js can handle many operations at the same time even though JavaScript code normally runs on a single main thread. The event loop keeps checking for work and decides when callbacks, timers, I/O operations, and other asynchronous tasks should be processed.
The tricky part is that not every asynchronous operation behaves the same way. Node.js uses different event loop phases and also interacts with the operating system and its underlying libraries to handle tasks such as file operations, networking, and timers. Understanding this is essential for explaining Node.js performance in interviews.
What you'll walk away knowing