What is Docker Images and Explain in 10 bullet lines?

Collection of file systems

One copy of docker image get attached to each container.

From one image multiple containers can be created

Layered structure

Each layer is each File system

Layer 0 should be base image or Root FS

Once image is attached to container, these layers will be attached to the container as a single layer

The layers in image will be on read only format, and to have the changes the thin layer in container should be used and commit that and form a new image

For creating docker images one of the following can be used
– Layer by layer adding (using existing container)
– All layers in one go (using docker file)