Why would I want a user to be external vs. internal?
Answer
External users are users loaded from your external SIS system (Banner, etc.)
Users that are not part of that system (Banner, etc.) are defined as internal (i.e Community Borrower).
Internal Users do not use external authentication, and instead rely on usernames and passwords. This is useful when your campus authentication system (LDAP, Shibboleth, etc.) is down for any reason. It's a good idea to set up at least one internal user with Admin privileges in the event that your authentication is unavailable and you need to log in.
You can use the Toggle option to switch a user between external and internal when necessary.