Docker

Builds an image from a Dockerfile — each instruction becomes a cached layer, so unchanged steps stay fast on rebuild.

List the images stored locally, see what uses disk, and remove the ones you no longer need.

Downloads an image (or just its newer layers) from a registry without starting a container from it.

Uploads a tagged image to a registry so it can be pulled elsewhere — the last step before a deploy picks it up.

Gives an existing image an additional name — most often to point it at a registry before pushing.