These are similar in function to AGV's. They are designed generally for reconaissancel, but could and have been deployed offensively. They may also be used to take supplies over otherwise hostile terrain.
They tend to mostly have cameras, and use telemtry for control - so although unmanned, they are not really automated yet. Processing terrain is fairly difficult to acheive, although that technology has been used in guided missiles for a long time. Many guided missiles could therefore be though of as kinds of UAV's which in turn are kinds of robots.