Containerd is an sector-regular container runtime that leverages runc and was developed by having an emphasis on simplicity, robustness and portability. containerd is definitely the core container runtime with the Docker Motor. Containers just take up much less space than VMs (container visuals are generally tens of MBs in sizing), https://emilianoevkzn.ltfblog.com/26349613/how-much-you-need-to-expect-you-ll-pay-for-a-good-containers