Predating digital computing, the Sensorama was a mechanical device.
Virtual reality (VR) is an interactive computer-generated experience taking place within a simulated environment, that incorporates mainly auditory and visual, but also other types of sensory feedback like haptic.
This immersive environment can be similar to the real world or it can be fantastical, creating an experience that is not possible in ordinary physical reality.
The Virtual Reality Modelling Language (VRML), first introduced in 1994, was intended for the development of "virtual worlds" without dependency on headsets.
The Web3D consortium was subsequently founded in 1997 for the development of industry standards for web-based 3D graphics.