What is the difference between a Workflow and a WorkflowTemplate?

• Workflow: A specific instance of a workflow execution with concrete parameters and runtime information. It's like running a specific job.

• WorkflowTemplate: A reusable workflow definition that can be instantiated multiple times with different parameters. It's like a blueprint or template.

# WorkflowTemplate - reusable template
apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
  name: hello-world-template
spec:
  entrypoint: whalesay
  templates:
  - name: whalesay
    container:
      image: docker/whalesay
      command: [cowsay]
      args: ["{{workflow.parameters.message}}"]

# Workflow - specific instance
apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: hello-world-
spec:
  workflowTemplateRef:
    name: hello-world-template
  arguments:
    parameters:
    - name: message
      value: "Hello DevOps Team!"