Virtual Reality is an immersive and interactive artificial environment
which is experienced through sensory stimuli (such as sights and sounds).
It is provided by a computer or a mobile through a headset
and one's actions partially determine what happens in the environment.
For more information and history, check Wikipedia.
vr apps are developed to use with the Google Cardboard Headset.
The apps apps will be available in major app stores soon.
The Google Cardboard Headset can be purchased separately for $15 USD or less
from Google, Amazon or stores such as Walmart and Target.