What does the Docker command 'docker ps' do?

The command 'docker ps' is specifically designed to list all the currently running Docker containers on a host. When executed, it provides a snapshot of active containers, displaying important information such as container IDs, names, and the status of the containers, including how long they have been running. This command is essential for users to monitor and manage their running applications effectively since it gives quick visibility into what is active at any given moment.

The context of each of the incorrect options helps clarify the specific function of 'docker ps':

• Creating a new container is done using the 'docker run' command, which both creates and starts a container from a specified image.

• Removing a container would utilize the 'docker rm' command, which is not related to listing any current container's status.

• Building an image is accomplished using the 'docker build' command, which compiles source files into a Docker image, unrelated to the state of current containers.

Understanding the correct command usage is vital for efficient Docker management, reinforcing the importance of 'docker ps' in routine operations.