Schrödinger's cat is a thought experiment, sometimes described as a paradox, devised by Austrian physicist Erwin Schrödinger in 1935. It illustrates what he saw as the problem of the Copenhagen interpretation of quantum mechanics applied to everyday objects.
The hypothetical scenario is that you put a live cat in an explosion-proof box with a bomb. Until you open the box, you'll have no idea if the bomb exploded and the cat died, or maybe the bomb didn’t explode and the cat is still alive.
What would happen if we put Schrödinger inside the box and the cat opened the box door?