Virtual Reality (VR) makes the user dive into a world that is 100% virtual and requires the use of a special equipment (vr headset), while Augmented Reality (AR) is based on a real environment but adds some virtual 3D elements to it.
Diminished Reality is the opposite of Augmented Reality: instead of adding virtual elements to the real world, Diminished Reality virtually removes some elements of a real-life environment. The world-premiere Frame Removal combines both Diminished and Augmented Reality.