Image vs Container — the recipe vs the meal

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What this covers

Images are recipes (immutable files on disk); containers are meals (running instances). Walk through `docker run` — twice — and see why the image never changes.

1. The recipe / meal analogy
2. docker run hello-world — one image, one container
3. Two containers from one image — writes don't cross
4. The image never changes — a third run starts fresh
5. Programmer's analogy: class vs instance
6. A common mistake: run vs exec
7. Cleanup: docker ps -a, docker rm, docker rmi