NVidia is a hardware company. I guess that would put it closer to the PC in your question than AI. But neither is a proper description, PC is the whole thing you go to buy somewhere, and NVIDIA doesn’t sell PCs, they sell PC pieces. They don’t develop AI either as far as I know. The hardware they design and build might be more aimed to one direction or other, but no matter the usage, what they do is create hardware.

AI, graphics cards… That’s just the marketing to sell what they build.