iCalendar (iCal) is a standard way to exchange calendar information between software systems. BookThatApp (BTA) supports the iCalendar standard so you can export and import your bookings to any calendar product that supports that standard such as Google Calendar, Microsoft Outlook, and Airbnb for example.
Using iCal is not real-time. For example, Google checks BookThatApp's iCalendar feeds anywhere between every 6 - 24 hours. BookThatApp checks incoming calendar feeds once per hour.
Please note that BTA can also connect directly to a Google Calendar via the API. The advantage of this approach is that the synchronization between calendars happens in real-time. Please see our article on Staff Accounts to learn more.