A mobility robot is a robot that is designed to help handicapped and disabled people move around. It might have wheels, but most often it will have legs so it can climb stairs and uneven ground. It might also take the form of a mobility suit, which is a kind of robot that surrounds the shape of your body, arms and legs.
Most of these innovations are from Japan, the robotics capital of the world, where a growing elderly population creates a huge market for such devices. http://www.mobilitynow.co.uk/top-10-amazing-mobility-robots-for-the-handicapped-and-disabled/ -Thanks, Jesper!