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- is a layer of filesystem. like rootfs +userfs+ apps+ apps
- all layers are read only.
- layer wise we can create container.
- when we pull the image then in var/lib/docker folder images is downloaded
- when we create the container then in var/lib/docker folder merged layer is created with RW
- file system conflict in layers then top layer is given priority.
- when we stop the container then merged layer is removed
- image is assigned to a user then a container is created
- with inspect we can see the metadata of an image
- with one image can create multiple container.
- image can be pushed to a registery