Which command is used to display the version of Docker?

The command used to display the version of Docker is "docker version." This command provides detailed information about the Docker installation, including the version numbers of the client and server as well as the Git commit ID. It is a straightforward and effective way to verify which version of Docker is currently running on your system, which is critical for ensuring compatibility with images and containers, as well as for troubleshooting any issues that may arise.

In contrast, while "docker info" provides a wealth of information about the Docker environment, including system-wide information and configuration details, it does not specifically focus just on the version. Other options like "docker status" and "docker show version" do not exist as recognized commands in Docker CLI, making them unsuitable for this task. Hence, using "docker version" is the most reliable method for quickly determining the version of your Docker installation.