What effect does running 'docker system prune' have?

Running 'docker system prune' is a command that cleans up your Docker environment by removing unused data. The command specifically targets stopped containers, unused networks, and dangling images, which are images that are no longer associated with any tag and thus not directly referenced by any existing container.

By using this command, you effectively reclaim disk space that has been used by these resources that your Docker environment no longer needs. This helps in keeping your environment tidy and efficient, ensuring that you do not have leftover resources that could otherwise lead to confusion or wasted disk space.

The focus of this command on stopped containers, unused networks, and dangling images reinforces its purpose as a comprehensive cleaning tool while ensuring that currently running containers and images in use remain intact.