Following accesses are defined for the contact:
1. Private
a. Contact will be visible only to the Created User or the respective Contact Owner.
2. My Team
a. Contact will be visible to the Contact Owner and his team.
3. Public
a. Contact will be visible for all users in the system.
In case, you do not have access to a particular record, information about that record is not revealed and displayed as 'XXX' in the different screens of the application.
E.g., when you have view access to a particular opening, but not to the Account or Contact of that opening, "XXX" is displayed in the Account & Contact fields.