[Matt3o12_]

Docker images use the union file system. That means when a new version of that image is available, you often only pull a few megabytes from the hub because it already has the OS.

A docker container is also way more lightweight. Instead of running a full OS, you I only run one process. So your docker image starts within seconds

[ccozan]

Is this more like a Solaris zone or a Linux chroot-ed env?

[nickstinemates]

A lot like Linux chroot, with some additional features, restrictions, and a mechanism to share them easily.