Public contact? Internal contact?
The difference between these two is:
Public contact: Shown on the website; anyone can access it. Used for anyone who wants to
get in touch with you, or for contacting you in case of a problem/complication with the booking.
Internal contact: Not shown on the website; only admins can access it. Only used for
contacting you in case of a problem or complication with the booking.
Both are optional.