CalDAV and CardDAV are network protocols that allow you to synchronize calendars (CalDAV) or contacts (CardDAV) via WebDAV. These interfaces allow data to be exchanged between Daylite and external programs such as Apple Calendar or Apple Contacts.
How to connect Daylite with Apple Contacts app (CardDAV)?
How can I test whether your Daylite server's CalDAV/CardDAV interface works generally?
How do I set up Daylite to sync with the Apple Calendar App on macOS (CalDAV)?
How do I connect Daylite to the Apple Contacts app on the Mac (CardDAV)?