When you spin up a database inside a Docker container, you are essentially launching an entirely isolated, lightweight operating system that lives inside your physical machine. This isolated environment has its own file system, its own memory limits, and crucially, its own private network. By d...

Source: [Dev.to](https://dev.to/kshitijjan/how-docker-maps-a-containerized-port-to-your-local-machine-3d95)

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