What command do you use to list all running containers?

The command used to list all running containers is docker ps. This command is a standard part of Docker's command-line interface and provides a succinct overview of active containers, including information such as container IDs, names, statuses, and the images they are running.

The docker ps command is specifically designed to serve this purpose, making it easy for users to monitor their containerized applications. When executed, it will only display running containers by default. If users want to see all containers, including those that are stopped, they can append the -a option to the command.

In contrast, docker list and docker show are not valid Docker commands. They do not exist in the Docker command set, highlighting the necessity for familiarity with valid commands when interacting with Docker's ecosystem.

The term docker containers seems like it could be a command; however, it is actually a phrase rather than a valid command. There isn’t a direct command in Docker for that phrase, emphasizing the importance of using the correct command in the Docker CLI for efficient management of containers.