Docker works by using a client-server architecture. The Docker client talks to the Docker daemon, which does the heavy-lifting of building, running, and distributing the Docker containers.
For example, when you run a Docker container, the Docker client sends a request to the Docker daemon, which then pulls the image associated with the container from a registry. The Docker daemon then creates the container and runs it on the host machine. The container is then accessible to the host machine, and any other machines that have access to the host machine.