Create terms.md

reference/terms.md

@@ -0,0 +1,18 @@
+---
+title: Terminology
+excerpt: Here are some of the terms used in Seafile
+category: 658bc87fd352d6004fe43f8f
+isReference: true
+slug: terms
+---
+
+## Users
+
+- **user_id**: The unique user id in the [email protected], stored in EmailUser.email in ccnet_db. In old version, this is the same as a user's real email. In new version, user's real email is stored in contact_email field instead. It is unchangeable.
+- **email**: Same as user_id. The term is still used in API's returned value. The term should be avoided in other places.
+- **username**: Same as user_id, used internally in Seafile's code.
+- **contact_email**: User's contact email, which is also a user's real email. It is changeable.
+
+
+
+