WebDav is a protocol, based on top of HTTP, that allows clients remote content authoring, such as creating, editing and deleting content.
The protocol itself is pretty old, dating back to the late 90ies.
While not really popular, even modern systems like NextCloud, OwnCloud, and also the widely-used NAS systems by Synology do support this standard - and also Zope!
How to activate WebDav support in Zope? The WebDav support in Zope had been temporarily removed, as Zope switched from the legacy ZServer to the standard WSGI approach, and WebDav was coupled to the ZServer, for no obvious reasons....