What is difference between docker pool and docker registry?

Question

I was asked this question in one interview and was not able to answer it. Also didn't find any relevant information regarding it.

Answer 1

A Docker registry is, as said in the Docker documentation :

[...] a hosted service containing repositories of images which responds to the Registry API.

There is no explicit definition in the documentation about a Docker pool. The part of the documentation where you can understand what is it, is the page Use the Device Mapper storage driver. In substance, the Docker pool is a storage pool used for image and container management.

Read also What does “Thin Pool” in docker mean? for more information.