Introduction NodeJS has revolutionized server-side development by proving that a single-threaded runtime can handle thousands (or even tens of thousands) of concurrent requests efficiently. This often surprises developers coming from traditional multi-threaded environments like Java or PHP, where each request typically gets its own thread. But how does NodeJS achieve this without blocking or crashing under load? The secret lies in its event-driven, non-blocking I/O architecture , powered by the event loop and smart delegation of work using thread pool with the help of Event Queue . It emphasizes on concurrency (handling many things at once) rather than parallelism (doing many things simultaneously on multiple CPU cores). If you've read my previous articles — A Gentle Introduction to the Foundation of Node.js Architecture , Deep Dive into Node.js Architecture and Internal Workings , and What is Node.js: JavaScript on the Server Explained — you'll already have a solid foundation.…