This is a promo video of the BionicWheelBot from Festo (not to be confused with Fisto,the protectron robot from Fallout: unique Vegas I reprogrammed into a pleasure model), a robotic spider that can transform and roll out as a ball (inspired by the genuine-life wheel spider seen at the beginning of the video). Why does it exist? Your guess is as good as mine, or unless you didn't guess 'To grow to truck size and enslave humanity',in which case your guess sucked and was incorrect. Did you even go to guessing school? hold going for the video, complete with a way too dramatic soundtrack.
Source: geekologie.com