This is a modular snake robot from Biorobotics Lab, Carnegie Mellon University in Pittsburgh, PA. The robot wiggles around, twists, turns, climbs walls and flight of stairs, swims and does a host of other things that other conventional legged or wheeled robots cannot do.
What I am not sure about is the snake robot's raison d'etre. I suppose it can be used for military purposes and in law enforcement. However, the YouTube video of the robot looks pretty amazing. That snake is very dynamic.