vCard Extensions to WebDAV (CardDAV) is an address book client/server protocol designed to allow users to access and share contact data on a server.
The CardDAV protocol was developed by the IETF and was published as RFC 6352 in August 2011.
[2] CardDAV was proposed as an open standard for contact management in August 2011.
In October 2013, the standard received an update that made it possible to capture higher-resolution contact images and achieve lower data consumption.
[3] The specification has been proposed as a standard by IETF as the RFC 6352 in August 2011 by C. Daboo from Apple Inc.