jay22111 Correct.
It's an VR API. Like DirectX is a media API
Developers make their software compatible with it, hardware manufacturers make their hardware compatible with it. Now all the software can work with all the hardware and vice versa. The "only" thing left is making it work on the platform you want to use it, Windows, Android, Linux, PlayStation. But you don't have to redo the whole VR software.
Without this API you have to write/code everything specifically for a certain device, hence the Android app is not compatible with GearVR, even though they can both be used on the same phone. With OpenXR much of the same code can be used on a wider range of systems and future devices. It's why your games made in 2010 will still work on hardware released in 2020.
arm (phone/Quest) processors, Intel/AMD processors and graphical processors (nVidia/AMD/Intel) also don't speak the same "hardware language". As you can see in the image of companies supporting OpenXR, they will alll be compatible with it.
It would be really cool if we now can get a standard API like that for sextoys too! Which I'm very sure will come! Who knows it's already being developed? wink wink nudge nudge