Not every robot works on its own; some are worn. An exoskeleton is a powered frame worn on the body that supports movement, adding strength or taking weight off joints and muscles. It senses the wearer's intended motion and assists it rather than moving on its own.
Such devices can reduce strain in physically demanding work and help people regain or extend movement. The hard part is reading intention smoothly, so the frame feels like an extension of the body rather than something to fight against, which demands careful sensing and gentle, well-timed assistance.