Google Cardboard is a virtual reality (VR) platform developed by Google for use with a fold-out cardboard mount for a mobile phone. It is intended as a low-cost system to encourage interest and development in VR.
Got the Google Cardboard for Christmas and just gave it a try. Definitely, I got my money’s worth (appr. 20$), it was easy setting it up and its performance was more than decent.
While it’s no Oculus Rift headset, Google’s Cardboard initiative has a huge role to play in VR by putting it in the hands of anyone with $25 and a smartphone. CNET