What is PM2 and why is it used?

PM2 is a popular production process manager for Node.js applications. It helps you:

• Manage and keep apps alive forever (auto-restart on crashes).
• Run apps in cluster mode easily.
• Monitor resource usage (CPU, memory).
• Handle zero-downtime reloads.

npm install pm2 -g

pm2 start app.js -i max # Runs in cluster mode with max CPU cores