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

Pod is container instance.

That is the output of replicas: 3

Think of one deployment can have many running instances(replica).

//deployment.yaml
apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: tomcat-deployment222
spec:
  selector:
    matchLabels:
      app: tomcat
  replicas: 3
  template:
    metadata:
      labels:
        app: tomcat
    spec:
      containers:
      - name: tomcat
        image: tomcat:9.0
        ports:
        - containerPort: 8080