Difference between targetPort and port in Kubernetes Service definition

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A Kubernetes Service can have a targetPort and port in the service definition:

kind: Service
apiVersion: v1
metadata:
  name: my-service
spec:
  selector:
    app: MyApp
  ports:
  - protocol: TCP
    port: 80
    targetPort: 9376

What is the difference between the port and targetPort?

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