In short
Storing and distributing Docker images — Docker Hub is the public default, while private registries (ECR, GCR, self-hosted) are used for proprietary images in real production environments.
How to learn this
- 1Push an image you've built to a registry (Docker Hub or a free-tier private registry).
- 2Learn to tag images meaningfully (version numbers, not just `latest`) before pushing.
- 3Understand why private registries matter for any non-open-source application.
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