Google cardboard is a virtual reality platform developed by google for use with a head mount for a smartphone.
HOW GOOGLE CARDBOARD WORKS:
Basically an google cardboard app splits an image on yours phones screen into two. You then insert your phone into an google cardboard and the two lens uses in google cardboard gives a 3d virtual reality. Which looks like you are watching it in reality.
With the help of an google cardboard we can watch movies, sort 360 degree videos. And even we can play some games using google cardboard. We can buy it online from any store. we get it for rs.300 it is the starting prices of google cardboard.
The experience of google cardboard is really amazing. It seems like we are different 3d world.