What is POD?

A pod is the smallest execution unit in Kubernetes. A pod encapsulates one or more applications. If a pod (or the node it executes on) fails, Kubernetes can automatically create a new replica of that pod to continue operations.
When pods contain multiple containers, communications, and data sharing between them is simplified. Since all containers in a pod share the same network namespace, they can locate each other and communicate via localhost. Pods can communicate with each other by using another pods IP address or by referencing a resource that resides in another pod.
Pods can include containers that run when the pod is started, say to perform initiation required before the application containers run. Additionally, pods simplify scalability, enabling replica pods to be created and shut down automatically based on changes in demand.