What command is used to remove unused Docker objects?

The command used to remove unused Docker objects is "docker system prune." This command is particularly powerful because it not only removes unused containers but also cleans up dangling images and networks that are not associated with any containers. By executing this command, users can reclaim disk space that might be wasted on artifacts from stopped containers or outdated images.

It's essential for maintaining a clean and efficient Docker environment, especially in development and production scenarios where unused resources can accumulate over time, potentially leading to confusion or unnecessary costs.

Other options do not correspond to actual Docker commands. "docker clear," "docker remove," and "docker cleanup" are not valid commands recognized by Docker for removing unused objects, which illustrates the importance of using the correct syntax and terminology when managing Docker resources.