From Code on Your Laptop to a Universal Box: A Beginner's Guide to Dockerizing Node.js

As a software engineer, one of the first frustrating phrases you will hear is, "Well, it works on my machine!" This happens when code runs perfectly on your computer but fails on a colleague's laptop or a production server. The reason is usually a small difference in the environment, like a different Node.js version or a missing system library. This is where Docker comes in. Think of Docker as a way to create a standard, universal box for your application. This box contains everything your code