The software described in this documentation is either no longer supported or is in extended support.
Oracle recommends that you upgrade to a current supported release.

4.12 About Image Digests

From version 1.6.0 of Docker, registry version 2 or later images can be identified by their digest (for example, sha256:digest_value_in_hexadecimal). You can list the digest by specifying the --digests option to the docker images command. You can use a digest with the docker create, docker pull, docker rmi, and docker run commands and with the FROM instruction in a Dockerfile.