Briefly the acronym is recognized as VR and come with this comes with this definition:
Virtual reality is the term used to describe a three-dimensional, computer generated environment which can be explored and interacted with by a person. That person becomes part of this virtual world or is immersed within this environment and whilst there, is able to manipulate objects or perform a series of actions.
You can try getting steps with these links:
- webvr samples;
- experiments with webvr;
- developers google.com web fundamentals vr;
- starting with existing solutions;
Stages are simple: a 3D content is put into a space called a scene and is presented in a special way for virtual reality devices.
Hope this help !