What is a Docker image. Explain in 10 points.

docker images are stored in hub.docker.com called registry.
All the layers have relationship with each other if you are pulling the top layer the parent layer will be pulled automatically
It's the layers of file system
Docker image consists of multiple filesystems -- ROOTFS + USERFS + ...
Docker image has file system versioning.
For encrypting docker images, sha2-256bit algorithm is used.
All these layers merge to create one layer called mount.
We can see the layer information using "df -kh" and also the memory using "du -h --max-dept=1"
When we start a container there is a merge layer will get created, which is the combination of all the layers which we have pulled
When we add some data into the container and even we stopped the container after that, the data will be available under overlay2 folder as a layer, and it will get attached to the container once is started.

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