Understanding the Node.js Event Model

Node.js applications run in a single-threaded event-driven model. Although Node.js implements a thread pool in the background to do work, the application itself doesn’t have any concept of multiple threads. “Wait, what about performance and scale?” you might ask. At first a single-threaded server might seem counterintuitive, but once you understand the logic behind the Node.js event model, it all makes perfect sense.