Docker images
Docker image files look like any other file on your local machine, except they are stored in a special format that can only be understood by Docker. Locally the image files are stored inside the /var/lib/docker/image/overlay2 directory. To see what images are available, you can take a look at the repositories.json file, which looks as follows:
{
  "Repositories": {
    "hello-world": {
      "hello-world:latest":
        "sha256:feb5d9fea6a5e9606aa995e879d862b82
         5965ba48de054caab5ef356dc6b3412",
      "hello-world@sha256:
        10d7d58d5ebd2a652f4d93fdd86da8f265f5318c6a7
       3cc5b6a9798ff6d2b2e67":
         "...
