In a car with an automatic transmission, when you shift into `P`, there’s a little peg called the “parking pawl” that sticks into one of the gears of the transmission, physically locking it.
In both automatic and manual cars, there’s also the “parking brake”. The parking brake is a special brake separate from the normal brakes, and is usually engaged purely mechanically – the parking brake lever physically pulls a cable or hydraulic cylinder to clamp the parking brake down.
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