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Reference.org
Differential wheeled robot
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<p>A differential wheeled robot is a <a href="/facts/Mobile_robot/klkTEo39">mobile robot</a> whose movement is based on two separately driven <a href="/facts/Wheel/SlIWX3xd">wheels</a> placed on either side of the robot body. It can thus change its direction by varying the relative rate of rotation of its wheels and hence does not require an additional steering motion. Robots with such a drive typically have one or more <a href="/facts/Caster/ptSYoJ7P">caster</a> wheels to prevent the vehicle from tilting. </p>