Docker is a containerization technology that can quickly create a cluttered environment with unused and unwanted images.
Docker images are the fundamental building blocks of Docker containers, stored in a Docker registry.
Identifying and listing unused Docker images can be performed through various Docker commands.
Use 'docker images' command to list all the Docker images and 'docker image prune' command to identify and list all the unused images.
Removing unwanted Docker images can be done by using 'docker rmi' command to remove a specific image or use 'docker image prune' command to remove dangling or unused images.
'docker image prune' command with '-a' option to remove all unused images from the Docker environment.
Maintaining a clean environment is important for optimal performance and reducing unnecessary resource consumption.