Merge pull request #6577 from kubernetes/addSecretGlossary

add secret to glossary

_data/glossary/secret.yml

@@ -0,0 +1,15 @@
+id: secret
+name: Secret
+full-link: /docs/concepts/configuration/secret/
+related:
+- pods
+- volume
+tags:
+- core-object
+- security
+short-description: >
+  Stores sensitive information, such as passwords, OAuth tokens, and ssh keys.
+long-description: >
+  Allows for more control over how sensitive information is used and reduces the risk of accidental exposure, including [encryption](https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/#ensure-all-secrets-are-encrypted) at rest. 
+  A {% glossary_tooltip text="Pod" term_id="pod" %} references the secret as a file in a volume mount or by the kubelet pulling images for a pod.
+  Secrets are great for confidential data and [ConfigMaps](https://kubernetes.io/docs/tasks/configure-pod-container/configmap/) for non-confidential data.