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Automatic transmissions rely on hydraulic pressure to engage gears. If the engine is not running, no hydralic pressure, no gear engaged.
Make sure you put your vehicle in park when you park and, under most circumstances, it won't roll away! ;) Of course to be safe you should engage the parking brake as well, which will solve those rare circumstances when simply being in park is not good enough.
As far as those circumstances when "park" is not enough - if I correctly remember how automatic transmissions work - placing the transmission in park engages a park dog which will not allow the (drive) wheels to spin in the same direction, but will allow them to spin in opposite directions. Pretty rare to be in a (parked) situation where this could happen but it is possible.
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