Isolation, repeatability and speed of deployment:

- Docker images are portable. They will run anywhere there is Docker. No surprise missing system packages when deploy.

- They are isolated from the the rest of the machine. Inconsistencies between dev and prod are minimized greatly.

- Kubernetes allows you to deploy stateless, immutable images using a declarative manifest. IMO this is far superior to imperative scripts that are used in a lot of places.

- Kubernetes pods start up in seconds when they are added or restarted. Deployments for me routinely take under a minute. Compared to our EC2 deployment strategy which can easily take over half an hour to deploy a single node.

The list goes on but these are the key things for me. I would suggest checking out some videos by Kelsey Hightower is want to see more of it in action.

The key benefit for me, and the reason I use it for my personal projects, is that it makes it easy to deploy the app. The Dockerfile is basically a list of commands, to install packages, copy files over etc once you have that and build it into an image. You can then do docker run from anywhere on any os and expect consistent results.

You could try https://kubernetes.io/docs/concepts/overview/what-is-kuberne... for now.

Kubernetes is basically a wrapper around Docker. It adds a lot of functionality but it's main job is handling the scheduling/management of Docker containers.