Docker engine uses containerd to run containers. Containerd was born from Docker company. Containerd is probably the most popular runtime for Kubernetes. GKE us

Docker engine uses containerd to run containers. Containerd was born from Docker company. Containerd is probably the most popular runtime for Kubernetes. GKE uses containerd as well. Docker hub is absolutely the most popular registry for open source software and configured as default address for kubernetes. Nothing of it is irreplaceable for sure. But Docker made a big contribution to container world, regardless.