3D movies are equivalent to what you'd experience in a movie theater: they appear on a rectangular screen and have an illusion of depth.
Apple spatial videos captured with the AVP or iPhone 15 also have an illusion of depth when viewed with the AVP.
Apple immersive videos, parts of which are shown in the AVP demo, make it appear as if you're there, though there are limits to the virtual world if you look way up, down, or to the side.
360 degree videos and photos completely surround you: you see the virtual world no matter which direction you look.