CardDAV

CardDAV is a protocol that allows applications to access and synchronize contact information stored on a server. Think of it as a way for your contacts—like phone numbers and email addresses—to stay consistent across multiple devices, such as your phone, computer, or tablet. When you add or update a contact on one device, CardDAV ensures the changes are reflected everywhere, making contact management easier and more reliable. It is widely used by services like Google Contacts and Apple’s iCloud to keep your contact lists up to date seamlessly.