The NVIDIA Virtual Audio Device (Wave Extensible) (WDM) driver is a software component used by NVIDIA graphics cards to enable the system to output audio through HDMI or DisplayPort when using these interfaces for video output. It allows you to transmit both audio and video through the same cable when connected to a monitor, TV, or AV receiver that supports audio over HDMI or DisplayPort.
This driver is typically installed automatically when you install the NVIDIA graphics driver, but in some cases, it may need to be manually installed or updated to ensure proper functionality of audio over HDMI/DisplayPort.