terms

Open Virtualization Format (OVF)
Open Virtualization Format (OVF) is an open standard for packaging and distributing virtual appliances or, more generally, software to be run in virtual machines.
https://en.wikipedia.org/wiki/Open_Virtualization_Format

OVA and OVF: The Differences
OVF is not only the name of the packaging format standard, but it also refers to the package when distributed as a group of files. An OVA (open virtual appliance or application) is merely a single file distribution of the same file package, stored in the TAR format.
https://damiankarlson.com/2010/11/01/ovas-and-ovfs-what-are-they-and-whats-the-difference/