Power steering works by using a hydraulic pump to create pressure in a hydraulic fluid. This fluid is then routed to a hydraulic cylinder that is connected to the steering rack. The pressure of the fluid helps to move the steering rack, which in turn turns the wheels.
Electric power steering works in a similar way, but instead of using a hydraulic pump and fluid, it uses an electric motor to generate the power needed to assist the driver in turning the wheel.
Power steering is an important safety feature that makes it easier and safer to drive a vehicle. It can help to reduce driver fatigue and improve handling, especially in difficult driving conditions.