Pod, container

Your application probably consists of microservices. Each would be running in its own virtual machine (or physical machine... it doesn't really matter). Suc a virtual machine is our "container".
A container could be rarely a physical machine. Usually it would be a virtual machine on aws, azure, google cloud or our own server.
Container is created using some virtualization technology. Some examples are virtualbox, hyperv, vmware, kvm2, docker. My choice is to use docker.

For k8s container is a pod. Like a pod of whales (group of whales). But creation of the container might fail - thus one pod could have more than one container under it.

Summary: A pod is one (or more) machine (likely virtual) called "container".

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