Understand portal types in the customer portal
Portal type refers to the type of access that will be granted to the customer portal. The three portal types available in Zoho Creator are: Public, Private, and Restricted.
Public - Any user with the link to the customer portal can sign up and access it.
Private - Only users invited by the admin of the customer portal can access it. Users cannot sign up for the portal on their own.
Restricted - The users have to sign up and get approved by an admin in order to access the portal.
The choice of the portal type is decided by the admin depending on the type of the customers who may use the customer portal.