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An OVF, or Open Virtualization Format, is a package format that allows for the distribution of virtual appliances or virtual machines. It is platform-independent and can include one or more virtual disks and a VM configuration file (typically an .ovf or .ova file). The OVF package can be used to easily deploy complex multi-tier applications across different virtualization platforms.
References: Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course materials