[musical flourish]
Hello, this video presents an overview of the technologies of virtual and augmented reality for learning.
The content is from Laurie Harrison and Diane Michaud, both here at the University of Toronto
First let's have an overview of the terminology
virtual reality, augmented reality, and mixed reality
are known as extended reality technology
 or XR for short.
Each XR experience will vary in levels
of interactivity and immersion.
Virtual reality can be defined as any computer 
or video generated environment that
 mimics a real-life experience
Immersive virtual reality places the experiencer in another location entirely
the virtual environment entirely occludes the experiencers natural actual surroundings
It involves wearing a head-mounted display and often includes
handheld controllers.
Augmented reality is where the visible natural world is overlaid with a layer of digital content.
It must be viewed through a smartphone
tablet or non including goggles
that means glasses that you can see the world through but that will project digital content.
Mixed reality is similar to augmented reality except the virtual objects are integrated into the natural
world in a realistic manner
rather than hovering over a scene 
a virtual object will sit atop a surface realistically
and be obstructed by any object positioned 
between the viewer and the virtual object.
While some may not consider 360 videos
to be virtual reality
a 360 degree video places the viewer within a scene
where they can look around at the entire scene - above, below, and all the way around
A few more terms related to equipment
a head-mounted display or HMD 
 have an integrated display
that means two mini monitors 
behind stereoscopic lenses
also known as a VR headset or sometimes, VR goggles
contrast that with a VR viewer
in which you place a smartphone
which displays VR content as a split image viewed through the stereoscopic lenses
something like a "Google Cardboard" 
and there are many others
haptic feedback is the tactile sensations delivered 
as vibration through handheld controllers
or by wearing specialized responsive gloves 
that deliver tactile impulses
