Imagine PM2 as a tireless "maestro" or a "guardian angel" for your web applications, especially those running in a JavaScript (Node.js) environment. Its main purpose is simple: to ensure that your application—whether it's a website or an API service—remains always available to your users, 24/7. What does it do in practice? If your application "crashes" (stops working) for any reason, PM2 instantly detects it and restarts it automatically, often before the end-user even notices a problem. But it doesn't stop there. PM2 helps your application handle many visitors at the same time (what we technically call "load balancing") by intelligently distributing the workload. Simultaneously, it keeps a detailed "diary" (logs) of everything that happens, helping developers find and fix issues. In short, PM2 is the tool that transforms a simple application into a robust, professional service ready for the real world.