Which feature must be shared to allow others to make appointments on your calendar?

The feature that must be shared to allow others to make appointments on your calendar is the link to your appointments page. This link provides a direct way for others to access specific times that you have made available for appointments, ensuring that they can see the available slots and easily book a time without needing to access your entire calendar.

Sharing the entire Google Calendar is not necessary and could compromise your privacy, as it might display personal events that you do not want others to see. Individual appointment slots are created as part of the appointments page setup, so simply sharing those wouldn't provide others with the means to access your available times. Your availability schedule alone may not offer sufficient context or a user-friendly interface to book an appointment, making the link to your appointments page the most effective and appropriate method for allowing others to make bookings.