From a single picture it infers a hidden 3D representation, from which you can produce photorealistic images from slightly different vantage points (novel views).
I just want to emphasize that this is not a NERF where the model magically produces an image from an angle and then you ask "ok but how did you get this?" and it throws up its hands and says "I dunno, I ran some math and I got this image" :D.