"In computing, virtualization or virtualisation is the act of creating a virtual version of something at the same abstraction level[…]."
Wikipedia.

| Cluster | A set of worker machines, called nodes, that run containerized applications. |
| Deployment | An API object that manages a replicated application, typically by running Pods with no local state. |
| Pod | The smallest and simplest Kubernetes object. A Pod represents a set of running containers on your cluster. |
| Node | A node is a worker machine in Kubernetes. |
| Service | An abstract way to expose an application running on a set of Pods as a network service. |
| Kubectl | Command line tool for communicating with a Kubernetes cluster’s control plane, using the Kubernetes API. |