What is the difference between a pod and a deployment?

Question

I have been creating pods with type:deployment but I see that some documentation uses type:pod, more specifically the documentation for multi-conta

Answer 1

In kubernetes Pods are the smallest deployable units. Every time when we create a kubernetes object like Deployments, replica-sets, statefulsets, daemonsets it creates pod.

As mentioned above deployments create pods based on desired state mentioned in your deployment object. So for example you want 5 replicas of a application, you mentioned replicas: 5 in your deployment manifest. Now deployment controller is responsible to create 5 identical replicas (no less, no more) of given application with all metadata like RBAC policy, networks policy, labels, annotations, health check, resource quotas, taint/tolerations and others and associate with each pods it creates.

There are some cases when you wants to create pod, for example if you are running a test sidecar where you don't need to run application forever, you don't need multiple replicas, and you run application when you wants to execute in that case pod is suitable. For example helm test, which is a pod definition that specifies a container with a given command to run.