To start a container, it is sufficient to specify an image in the form of manufacturer/imagename. This is made possible by the Docker Registry, a kind of library for containers. After installation, Docker is connected to the official online Docker Registry: Docker Hub, which means that specifying the imagename is enough to download and launch the container: no matter what hardware, no matter what operating system, and no matter what other programs have already been installed on the system: Due to the encapsulation, the containers are isolated and independent and contain all the dependencies necessary for operation.