Check out example codes for "docker images command". It will help you in understanding the concepts better.

Code Example 1

docker images [OPTIONS] [REPOSITORY[:TAG]]

Code Example 2

docker images


NOTE:
To see which images are present locally, use the "docker images" command:
REPOSITORY   TAG      IMAGE ID        CREATED      SIZE
debian       jessie   f50f9524513f    5 days ago   125.1 MB
debian       latest   f50f9524513f    5 days ago   125.1 MB

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