The basic functions of a vehicle are moving, turning and stopping. Turning is performed by the steering system. Among the many components of an automobile, the steering system is one of those having the most significant influence on vehicle performance and reliability. Electric power steering systems and hydraulic power steering systems with motor-driven pump, both JTEKT original developments, are superior to conventional hydraulic power steering in regard to both efficiency and size. They are attracting attention around the world as products that contribute to environmental conservation while enabling comfortable driving.