What is the command to pull an image from a Docker registry?

The command to pull an image from a Docker registry is "docker pull." This command is fundamental in Docker, as it allows users to retrieve images from remote repositories, making it possible to access and use a wide variety of pre-built images that can be employed in their applications or development environments.

When you use "docker pull [image_name]," Docker connects to the specified registry (by default, this is Docker Hub) and downloads the image, including all its layers, to the local system. This allows for easy sharing and deployment of containerized applications, as developers can quickly access publicly available images or their own images that have been pushed to the registry.

The other command options, such as "docker fetch," "docker get," and "docker download," do not exist in Docker's command set. They do not perform the action of retrieving images and therefore would not achieve the intended result of pulling an image from a Docker registry.