A social robot is an autonomous robot that interacts and communicates with humans or other autonomous physical agents by following social behaviors and rules attached to its role. This definition suggests that a social robot must have a physical embodiment (screen characters would be excluded). Recently some robots have been developed that use a screen to display the robot's head. Such a machine is on the borderline of being a robot. If the body only functions as a holder for the screen then such a system cannot be considered a robot but if the robot has some physical motor and sensor abilities then such a system could be considered a robot.
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