In short
A containerization platform that packages an app with all its dependencies into a portable, consistent unit that runs identically on any machine — solving the classic 'works on my machine' problem.
How to learn this
- 1Install Docker and run a public image, e.g. `docker run hello-world`.
- 2Learn the core vocabulary: image, container, Dockerfile, registry.
- 3Containerize a simple Node.js app you've already built.
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